This has been an issue for about a year now, Where some times my chatbox is inside my head, Or in my head by sticking out a little, or some times it's fine, even with the same avatar!! but it works perfectly fine locally.

(I think you should be able to set the chatbox height per avatar in some sort of way, it would be really helpful for a lot of avatars (like avatars with big hats, ears, or anything on the head) and probably fix this issue as well!!)