(Answered.... by my self) When I EVA a kerbal on land, he flings upwards and then falls to the ground, and when I EVA in space, he flings off, accelerating, so there is no way for him to get back. I have a lot of mods, and mainly what I was wondering is which mods are the imcompatible ones or is doing this...
Mods:
Realism Overhaul with all required mods, RSS, Module Manager, EditorExtensions, PersistentRotation, RCSBuildAid, AIES(without some tanks), HyperEdit, FASA, RemoteTech, ActiveTextureManagement, ProceduralFairings, VenStockRevamp, TAC, TextureReplacer, ProceduralParts, FAR, KAS, KIS, Toolbar, RealChute, TweakScale, MechJeb, TakeCommand, DynamicControls, AnalogControls, B9Wings, KSCSwitcher, NovaPunch(Engines), VesselView, SovietEngines, JSI
Edit: It was Real Heat's Module flight intergrator