I was too entusiastic and sent two expeditions - to Eve and Duna. Before I discovered this EC nuance. And now have to switch between ships every 4 days.
About space station. I have one with Gravity Rings and once noticed what kerbal settled in Ring have 'cramped' space status, while station have plenty of space - for up to 20 kerbals. I moved unhappy kerbal to another module ('lab') and he became happy about living space. Does it normal?