I don't think I have this problem with any other saves, except for this one. It's some kind of invisible NPC, that is a bit of a stalker. For reference, the killall command doesn't get rid of him.
So, while on horseback, I sometimes have this unrelenting force pushing me sideways, while saying "Hmm?" or "Good afternoon". Sometimes when I'm not on horseback as well. I'll also hear this when changing cells. Sometimes, when entering combat, I'll hear "Never should have come here!". I know it's from the same source as there is no name preceding the subtitle.
Any ideas?

Load order:

Skyrim.esmUpdate.esmDawnguard.esmHearthFires.esmNchuzzrezar.esmDeus Mons.esmLevelersTower.esmmoonpath.esmLB_MuchAdoSnowElves.esmClimatesOfTamriel.esmApachiiHair.esmSPIKE.esmRaceCompatibility.esmWARZONES - Civil Unrest.esmUnofficial Skyrim Patch.espUnofficial Dawnguard Patch.espUnofficial Hearthfire Patch.espSkyUI.espDeus Mons_WithNPCs.espAuto Unequip Ammo.espBetter Auriels Bow.espBlackSacramentArmor.espBlackSacramentDBReplacer.espBrawl Bugs CE.espClean  Invisibility Effects plus Eyes Fix - Chameleon Version.espConnys Improved Hearthfire.espCrossbow_Basic_Collection_LListed_EN.espdD - Enhanced Blood Main.espdD-Dawnguard-EBT Patch.espdD-No Spinning Death Animation.espdovahkiinrelax.espAetheriumSwordsnArmor.espexplosivechickens.espFCKagrenacsInstantFortress.espgetoverherebow.espGZD - Ancient Falmer Crown.espHeadtracking.esphorkercompanion.espImmersive Battles.espImmersive Brigands.espImmersive Dawnguard.espImmersive Patrols.espImmersive Travelers.espImmersive Werewolves.espIncreased Bounty & Guild Rewards.espbloodierCombatv1.1.espKarliahArmor2.espAncient Falmer Crown Tweak.espLoadScreenTexts.espLost Art of the Blacksmith.espMadman's Lair.espMagicka Sabers.espMasterTheTimeAndSpaceTOGGLE.espAnise's Secret Spells.espNchuzzrezar.espRagnvaldBookFarengar+Ragnvald.espRealistic Lighting.espRealistic Lighting Patcher.espRealistic Lighting - Addon.espReally Radiant Raiment.espRun For Your Lives.espsheogorath_shout.espsheogorath_shout_loadscreens.espShootingStars.espskyBirds - Airborne Perching Birds.espSneaky_Serana.espSpace Wiking's Dwemer Exoskeleton.espsqueaky.espSuperSkyrimBros.espTBMTrueSnowElf.espTelekinesisImproved.espTHBoneHawkRingCraftable.espTHCraftableVampireArmory.espThor.espTS_BloodOmNomNom.espUFO - Ultimate Follower Overhaul.espUFO - Dawnguard AddOn.espUFO - Heartfire AddOn.espVampireClothingBugFix.espVampireDoubleWieldBoost.espVampirelordroyal.espVLCollisionFix.espHeartOfThunder.espLustmordVampireArmor.espposesivecorpses.espThe Dance of Death - Dawnguard Edition.espYellow_Mountain_Flower.espEMCompViljaSkyrim.espToL_Core_by_Brevi.espRealistic werewolf speed.esparmored-horses.espWRF_by_RolandSir_TAWUTD_DG.espBlaze Of Eventide.espNightingaleBowDmgIncDEFAULT.espNightingaleCrossbow.espJiubQuestMarkers.espKCEAssaultRifles.espBetter Necromancer's Amulet.espP1FlyingRing.espmpn.espmoonpath_questdata.espLB_MuchAdoSnowElves_Quest.espDwarvenMech.espUncle Sheo.espClimatesOfTamriel-VanillaNights-Lvl-2.espClimatesOfTamriel-Dawnguard-Patch.espDwarvenRes.espDragonMasks.espLoreWorthyHagravens.espCastle Stonespire.espPurpleEyes.espBurning Sky.espLimbwoodManor.espCraftable Light Ancient Nord Armor.espWetandCold.espInfernoStorm_Shout.espNecroRobes.espInsanity's Pale Blade.espRabbitsPlus.espRayeksEnd.espbearmusicianeng.esphrordisdossier.espUlfricForFem.espSkooma Incorporated.espInsanity's Dragonbane.espSmeltingDwarvenMetal.espThe Paarthurnax Dilemma.espBashed Patch, 0.espDr_Bandolier.espGhosu - Project Flintlock.espGhosu - Project Flintlock - Ammo Addon.esphothtrooper44_ArmorCompilation.espAlternate Hearthfire House Map Marker Optional Version 2.espWerewolfPerksixpanded_1.6.espWerewolfPerksixpanded_1.6b.espGuard Dialogue Overhaul.espBoethiaVolunteer.espWhen Vampires Attack.espFantasyEyes.espLostLongSwords.espstormcloakrobes.espTamriel Compendium.espTamriel Compendium - Skill Books.espTalsgarEssential.espEnhancedLightsandFX.espTheAvengersHawkeyeArrowWepMod.espImproved Dragon Shouts.espImproved Dragon Shouts - Dawnguard.espDFG's Blade & Dagger Sheathe Sounds.espWaterArrowsAndBolts.espWaterArrows.espbretpre.espPortable Campsite.espDryad Race.espMidasSkyrim.espBFSEffects.espVickysArmor.espSummonSkeletalHorde.espDestructionRebalanced.espDaedric Letters Warpaints.espDeadlySpellImpacts.espLock Overhaul.espCompanionValfar.espwar zone fix.esp

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