There seems to be some random bugs related to the Kerbals contained in pods.
Some examples -

-In a 3-person capsule, I send one of the Kerbals out to make room for my friend's EVA Kerbal. When he tries to get it, it still shows up as "full".

-I go back to the space center and my friend takes control of my craft. He flies around for a bit, and then when I come back, there is a Kerbal missing from my craft...

Just some mysterious stuff.

80eb2e7 only partially addresses this, but I'm making progress on this now.

Should be fixed via 32f77f8

I'll need to send a full update on kerbal EVA or board ;)

Yeah, a bit earlier today we were playing around and managed to clone a bunch of Kerbals on the Mun - we just kept switching between crafts and going into EVA lol

Also, related I guess, multiple EVAs from the same vessel by different players, causes rapid unplanned disassembly of said vessel.