A 19.5 (b60) (vanilla)
I'm not sure what happened, but I was fully encumbered and just made it back to my base as night fell. I jumped about the same time the jingle played and suddenly all my encumbrance slots just disappeared. I have no points in Pack Mule, nor do I have any armor mods equipped that reduce my encumbrance slots. It's not going to bother me too bad if I can't get those back, but if anyone can tell me if I could reverse this glitch, it'd be much appreciated. Game restart did not help.
EDIT: Never mind! Looks like just dumping my inventory and filling it back up returned them to normal. Not sure what happened, but it was weird as heck.