Problems with group chats?

I recently switched to fizz and was quite happy with it so far but one issue I have is a couple of group chats I’m in aren’t working properly now. I have an iPhone and group chat with other iPhone users still work. Individually I can text anyone and it works but as soon as at least one android user is in a group chat I can’t see any ones new texts anymore but they can see mine? Has anyone else experienced this before?