Sorry to hear that! Could you attach a screenshot taken right after you click a side? It will help me understand the possible reason.
I can't tell why this happens, unfortunately. Sorry about this!
If you can wait for the next version which shouldn't take long to be released, I think it will work fine for you.
In the meantime, if the problem is for team selection only, you can play in free-for-all (FFA) game mode which should be unaffected by it.