Hello,
I have a similar issue.
When I start F3 I'm logged out then I log and start normally a game. After I finish playing and use the X (dome) button to get back to F3, my avatar is either blank or as if I was logged out. My avatar name is there but my points is now 0. I have to log out then log in back to "fix" it.
It might by a little worst than we expect because I'm almost sure it's not adding the achievements point. Yesterday I unlocked one and the total remained the same.
The avatar and point to 0 is rerproducible everytime, I just need to double check the achievements points not adding up.
Thanks