Well, I am facing the same issue again (last time i just did without the ‘team’ page).
All of the pages, portfolio items and custom posts work fine with polylang, so it does seem that the problem is with the theme. I create a team member in two languages, russian and french. Whenever I change the info and bio for one language, it overwrites both.
Could you please look into it? It is really annoying, and I don’t seem to have a way around it like creating a team page with a default template.