It's a bizarre problem, and I have no idea what could be causing it. Only mods I have that touch the combat are tktk's mods. I looked online to see if anyone else had this problem, but I only ran into to questions from people who did not know how to shield bash. I'm almost certain it's a mod problem, since I have not changed my controls. I'm posting my mod list, though I don't think it'd be any help.
Active Mod Files:
Spoiler
00 Skyrim.esm01 Update.esm02 Unofficial Skyrim Patch.esp [Version 2.0.0a]03 Dawnguard.esm04 Unofficial Dawnguard Patch.esp [Version 2.0.0b]05 HearthFires.esm06 Unofficial Hearthfire Patch.esp [Version 2.0.0]07 Dragonborn.esm08 Unofficial Dragonborn Patch.esp [Version 2.0.0]09 Skyrim Project Optimization - Full Version.esm0A ClimatesOfTamriel.esm0B Lanterns Of Skyrim - All In One - Main.esm0C SPIKE.esm0D XFLMain.esm0E Weapons & Armor Fixes_Remade.esp0F Clothing & Clutter Fixes.esp10 Chesko_Frostfall.esp11 Rainbows.esp12 SplashofRain.esp13 AOS.esp14 DragonShoutVoice.esp15 randomthunder.esp16 mintylightningmod.esp17 MintyLightningMod_COT_Patch.esp18 TouringCarriages.esp19 Cutting Room Floor.esp [Version 1.0.2]1A StaticMeshImprovementMod-DragonbornTernFix.esp1B TradeRoutes.esp [Version 1.0]1C TradeBarter.esp1D 83Willows_101BUGS_V4_LowRes.esp1E Auto Unequip Ammo.esp1F Birdsofskyrim.esp20 Bring Out Your Dead.esp [Version 1.2.2]21 ClamsDropPearls.esp22 Dead Body Collision.esp23 DD_Dawnguard Additions.esp24 DD_Dragonborn Additions.esp25 Dual Sheath Redux.esp26 fFastTravelSpeedMult_4.esp [Version 1.0]27 Hunterborn.esp28 Hunterborn_Dawnguard-Patch.esp++ Hunterborn_Frostfall-Patch.esp29 manny Lantern Caretakers.esp2A More Salt Please.esp2B More Salt Please - Dragonborn addon.esp2C Moss Rocks.esp2D No Permanent Essentials Redux.esp2E No Permanent Essentials Redux -- Dawnguard.esp2F No Permanent Essentials Redux -- Dragonborn.esp30 No Permanent Essentials Redux -- Bring Out Your Dead Compatibility.esp31 PilgrimsDelight.esp32 Point The Way.esp [Version 1.0.2]33 RabbitsPlus.esp34 Radiant and Unique Potions Poisons and Booze.esp35 ShootingStars.esp36 skyBirds - Airborne Perching Birds.esp37 Skyrim Immersive Creatures.esp [Version v6.5]38 Skyrim Immersive Creatures - DLC2.esp [Version v6.5]39 Skyrim Flora Overhaul.esp3A SkyrimImprovedPuddles-DG-HF-DB.esp [Version 1.1]3B Smoking Torches.esp3C Traps Are Dangerous.esp3D WetandCold.esp3E WetandCold - Ashes.esp3F Character Creation Overhaul.esp40 Dragon Soul Relinquishment.esp41 Footprints.esp42 Footprints - Ash.esp43 NoxUE2.00.esp44 RaceMenu.esp45 RaceMenuPlugin.esp46 SkyTweak.esp47 vAutosaveManager.esp48 SkyUI.esp49 iHUD.esp4A TKDodge.esp4B BoundArmors.esp4C Cloaks.esp4D Cloaks - Dawnguard.esp4E 1nivWICCloaks.esp [Version 2.3]4F 1nivWICSkyCloaksPatch.esp [Version 2.3]50 ConvenientCrossbows.esp51 daedric_phelm.esp52 Elemental Staves.esp53 ExplosiveBoltsVisualized.esp54 hothtrooper44_ArmorCompilation.esp55 imp_helm.esp56 imp_helm_imp.esp57 imp_helm_dawn.esp58 imp_help_dbrn.esp59 imp_guard_helm.esp5A Lore Weapon Expansion.esp [Version 1.1]5B Lore Weapon Expansion - Goldbrand.esp [Version 1.1]5C LostLongSwords.esp5D PIVariety.esp5E PrvtI_HeavyArmory.esp5F PrvtI_HeavyArmory_DG_Addon.esp60 Unique Uniques.esp [Version 1.5]61 ASIS-Encounter Zones.esp62 Smithing Perks Overhaul_Remade.esp63 Complete Crafting Overhaul_Remade.esp++ Complete Crafting Overhaul_Dawnguard.esp64 Complete Crafting Overhaul_Hearthfire.esp65 Complete Crafting Overhaul_Dragonborn.esp66 DeadlyDragons.esp67 AesirArmor.esp68 Gildergreen Regrown.esp [Version 1.2.5]69 In Your Shadow.esp [Version 1]6A In Your Shadow - Dawnguard.esp6B In Your Shadow - Dragonborn.esp6C Inconsequential NPCs.esp6D Inconsequential NPCs - Enhancement.esp6E OBIS.esp6F OBISDB.esp70 Bandit Patrols.esp71 Run For Your Lives.esp [Version 1.2.3]72 When Vampires Attack.esp [Version 1.1]73 silverfish.esp74 SkyrimChimneysRW.esp75 The Paarthurnax Dilemma.esp [Version 1.2.5]76 SkyrimCoinReplacerRedux.esp77 Appropriately Attired Jarls Redux.esp78 BetterQuestObjectives.esp79 BetterQuestObjectives-Dawnguard.esp7A BetterQuestObjectives-Hearthfire.esp7B BetterQuestObjectives-PaarDilemmaPatch.esp7C Book Covers Skyrim.esp7D Book Covers Dawnguard.esp7E Book Covers Hearthfire.esp7F Book Covers Dragonborn.esp80 BlockSparkles.esp81 Bounty Gold.esp [Version 1.0]82 CCO - Oblivion Carry Weights.esp83 CCO - Permanent Birthsigns.esp84 Distant DetailHF.esp85 DiversePriests.esp86 DiversePriests_BringOutYourDeadPatch.esp++ FSS-No pause between lines.esp87 Guard Dialogue Overhaul.esp88 WeaponsArmorFixes_GuardDialogueOverhaul_Patch.esp89 Borealis - Blessings of the Nine.esp++ Borealis - Falling Damage.esp8A Borealis - Soul Values.esp8B masser Size x0.5.esp8C mjhReducedGoldRewards.esp8D Rebirth Monster.esp8E SkyFalls Plus SkyMills - All DLC.esp8F secunda Size x0.5.esp90 SkyTEST-RealisticAnimals&Predators.esp91 Convenient Horses.esp92 dD - Enhanced Blood Main.esp93 dD-DG-DB-Immersive Creatures EBT Patch.esp94 AOS_EBT Patch.esp95 Soul Gems Differ - E.esp96 TheChoiceIsYours.esp97 TheChoiceIsYours_Dawnguard.esp98 BetterQuestObjectives-TheChoiceIsYoursPatch.esp99 Thieves Guild Requirements.esp9A BetterQuestObjectives-ThievesGuildRequirementsPatch.esp9B TimingIsEverything.esp9C TimingIsEverything_RunForYourLives_Patch.esp9D BetterQuestObjectives-TimingIsEverythingPatch.esp9E Waterbreathing Breathless Emerge.esp9F aMidianborn_Skyforge_Weapons.espA0 WeaponsArmorFixes_ambSkyforge_Patch.espA1 BetterQuestObjectives-AMBSkyforgePatch.espA2 AIMP - Antz in my Pantz.espA3 Chesko_Step418_SN.espA4 Oblivion Gates v3 without Markers - Skyrim + Dawnguard DLC.espA5 RealisticRoomRental-Basic.espA6 Realistic Lighting Overhaul - Dungeons.espA7 Realistic Lighting Overhaul - Dawnguard Interiors.espA8 Realistic Lighting Overhaul - Major City Exteriors.espA9 Realistic Lighting Overhaul - Major City Interiors.espAA Realistic Lighting Overhaul - Minor Cities and Town Interiors.espAB ClimatesOfTamriel-Dawnguard-Patch.espAC ClimatesOfTamriel-Dragonborn-Patch.espAD AOS_COT-DG Patch.espAE Supreme Storms - Cot Version.espAF CoT-WeatherPatch.espB0 CoT-WeatherPatch_DB.espB1 CoT-WeatherPatch_SupStorms.espB2 CoT-WeatherPatch_NL4.espB3 Brevi_MoonlightTales.espB4 BetterQuestObjectives-MoonlightPatch.espB5 Apocalypse - The Spell Package.espB6 HitStop.espB7 BFSEffects.espB8 DeadlySpellImpacts.espB9 AOS_DSI Patch.espBA Mighty Magick - Alteration.espBB Mighty Magick - Alteration Extras.espBC Mighty Magick - Conjuration.espBD Mighty Magick - Conjuration Extras.espBE Mighty Magick - Destruction.espBF Mighty Magick - Dual Casting.espC0 Mighty Magick - Fortify Magic School Enchantment and Alchemy Reversed.espC1 Mighty Magick - Illusion.espC2 Mighty Magick - Illusion Extras.espC3 Mighty Magick - Restoration.espC4 Mighty Magick - Restoration Extras.espC5 Mighty Magick - Scaling.espC6 PTAlchemyOverhaul_ONLY.espC7 Better Stealth AI for Followers.espC8 BetterQuestObjectives-BetterStealthAIPatch.espC9 UltimateCombat.espCA Dual Wield Parrying_SKSE.espCB DragonCombatOverhaulDragonborn.espCC AOS_DCOd Patch.espCD The Dance of Death - Ultimate Edition.espCE TKRecoil.espCF CCO - Dynamic Skill Progression.espD0 dD-No Spinning Death Animation.espD1 Beards.espD2 Brows.espD3 3DNPC.espD4 Clothing & Clutter_3DNPC_Patch.espD5 RealisticNeedsandDiseases.espD6 Hunterborn_RND-Patch.espD7 Disease Descriptions_RND Compatibile.espD8 XFLDialogue.espD9 XFLPlugins.espDA BetterQuestObjectives-XFLPatch.espDB Slightly Reduced Distance NPC Greetings.espDC SPTConsistentOlderPeople.esp [Version 1.8]++ moveitLWT.espDD NonEssentialChildren.espDE BetterQuestObjectives-NECPatch.espDF Alternate Start - Live Another Life.esp [Version 2.3.4]E0 BetterQuestObjectives-AlternateStartPatch.espE1 CCO - Diverse Races And Genders.espE2 dD - Realistic Ragdoll Force - Realistic.espE3 Animated Weapon Enchants.espE4 DawnguardRuneWeaponsFXSReplacer.espE5 RealisticWaterTwo.espE6 RealisticWaterTwo - Legendary.espE7 AOS_RWT Patch.espE8 DiversePriests_ConsistentOlderPeoplePatch.espE9 Skytest Immersive Creatures.espEA AOS_WetandCold Patch.espEB Scarcity - Less Loot Mod.esp++ Scarcity - 4x Loot Rarity.espEC aaaPatch.esp (this one is a small general patch I made in TES5Edit to resolve a few simple mod conflicts.)ED Bashed Patch, 0.espEE ASIS-Dependency.espEF ASIS.espF0 Dual Sheath Redux Patch.esp