Bugabugas

Hello! Having what I would call a... minor issue? Every time I try to EVA with a Kerbal (any class, I tried), both landed on Earth at KSC or in orbit (suborbital, polar, orbital, doesn't matter either), he puffs and dies. Literally puffs and dies. Had TAC warning me right in the split second I click EVA and see/hear a puff that Oxygen, Food and Water have ran out. Disabled it and still happened. Since it is nothing related to TAC, it must be some physics pressure law my Kerbals ain't following hehe like maximum pressure, or something, you tell me! Anyone has any idea what could be? Some mod missing related to changes from Kerbol System to Solar System+RO+RP-0?