Okay, so first issue spotted...
It seems to be acting randomly in flagging some posts for approval, and others not for approval even from the same authors. I have no idea why this is the case.
I'm approving as I see them, hopefully if it is affecting you after 5 posts it will shift you into the other user grouping and it won't happen anymore, but we're waiting to see what happens there.
But anyway, we know about it and are trying to solve it