So, I just installed a lot of new mods for Skyrim, and started a new character, and the opening sequence broke. The wagon in front of me stopped moving and my wagon flipped around and everything went crazy. Then a little further, the horse that's pulling the cart just stops, breaking the game.

I've searched online for causes, and obviously having too many mods can start bugging it up. I've read that Fores Idles could cause it. I disabled it, and still had the problem. The easiest solution is to get an alternate start mod, but I sort of like the vanilla beginning, and if there's a way to fix this, that'd be great. Here's my load order.

Update.esmDawnguard.esmHearthFires.esmDragonborn.esmSkyrim Project Optimization.esmClimatesOfTamriel.esmSPIKE.esmXFLMain.esmUnofficial Skyrim Patch.espUnofficial Dawnguard Patch.espUnofficial Hearthfire Patch.espUnofficial Dragonborn Patch.espTradeBarter.espDead Body Collision.espDual Sheath Redux.espImmersive Battles.espImmersive Brigands.espImmersive Dawnguard.espImmersive Dragonborn.espImmersive Factions.espImmersive Mercenaries.espImmersive Patrols.espImmersive Werewolves.espRealShelter.espConvenient Horses.espAuto Unequip Ammo.espSkyUI.espDragonbornArmorFix.esphothtrooper44_ArmorCompilation.espERSO 30 - Better Enemy AI.espSkyRe_Main.espSkyRe_Combat.espSkyRe_CraftingFix.espSkyRe_EncounterZones.espSkyRe_EnemyScaling.espSkyRe_StandingStones.espImmersive Events.espInconsequential NPCs.espRun For Your Lives.espWhen Vampires Attack.espBetterQuestObjectives.espBetterQuestObjectives-SkyRePatch.espBetterQuestObjectives-DBForevertoMisc.espGuard Dialogue Overhaul.espHeadtracking.espImmersive Weapons.espSkyTEST-RealisticAnimals&Predators.espTheChoiceIsYours.espTheChoiceIsYours_Dawnguard.espBetterQuestObjectives-TheChoiceIsYoursPatch.espThieves Guild Requirements.espHelgen Reborn.espEnhancedLightsandFX.espClimatesOfTamriel-Dawnguard-Patch.espClimatesOfTamriel-Dragonborn-Patch.espELFXEnhancer.espBetter Stealth AI for Followers.espBetterQuestObjectives-BetterStealthAIPatch.espDragonCombatOverhaul.espThe Dance of Death - Ultimate Edition.esp3DNPC.espVendorSaleDelay-Gone.espXFLDialogue.espXFLPlugins.espBetterQuestObjectives-XFLPatch.espReduced Distance NPC Greetings.espdD - Realistic Ragdoll Force - Reduced.espSkyRe_Races.espWATER.espGrassOnSteroids_NaturalEdition_Vanilla.espModel Manager.espTimingIsEverything.espDual Sheath Redux Patch.espReProccerNONPLAYERfix.espReProccerDragonborn.espReProccer.esp

It's Helgen Reborn. From the mod's description page;

That fixed it, thank you!