A bunch of mobs from the Dragonborn DLC just spawned in Falkreath randomly (Even Miraak himself). They are not hostile, when I talk to them, they become followers which I can have them carry my gear, send away or command to do something

What the [censored]?

Well, that sounds weird. Are you using any mods? And if you are, please post your load order.

Right its:

Update.esm

SPERG.esm

skyui.esp

azincourt.esp

faster vanilla horses.esp

leather.esp (Its an Armor mod)

dr_bandolierdg.esp

redguardknight.esp

vikingarmor.esp

SPERG.esp

SPERG-DB.esp

SPERG-DG.esp

warchiefarmor.esp

Hoodless Archmage Robes.esp

EnhancedLightsandFX.esp

ELFXenhancer.esp

ELFX - Exteriors

SummonMountsDragonborn.esp (Had this one for days, the mod has nothing to do with what I am mentioning)

Duel - Combat Realism

Alternate Start - Live Another Life.esp

Path of Shadows - Sneak

PoS - Combat.esp

PoS - Magic.esp

PoS - Alchemy.esp

Sabrecatgear.esp

None of those mods in my opinion should cause the problem described. Which deepens the mystery.

One thing however stands out: where the hell are the unoffiicial patches?