It's just me or how it is in the game (which is pretty annoying if it is), but once page 1 in my inbox is full, any message sent after it will delete the last message on the list, and it'll keep going like it. Now, I don't know if it deletes it or not but I assume it because I can't go to the 2nd, 3rd, 4th, etc page. I've had many old messages I haven't manually deleted being deleted like this (which has been happening for a while now).
Admin/others, know anything about this problem? ;(