That's awesome! Thanks for the reply!
I assigned the squads to the various missions I think they would be good at, then hit join button for the leader to join, then unclicked. The star value wouldnt always change and sometimes hovering my mouse over another squad whether I was attached or not. I'll see if I can recreate it.
Joining a mission doesn't always remove a star. The mission difficulties are bands of values, 35-55 is 2 stars for example. A 100 sided die is rolled with modifiers both from the environment (hinted at in the mission descriptors red and green text) and the squad. The Leader provides a modifier as well. It could be that the modifier is not enough to remove a star even though it is actually reducing the difficulty. Does that help?
I mean you very well could have a bug and in that case I do want to fix it!