This isn't the first time someone has had this issue.
When you are hovering at the cusp of user--> scholar you encounter the interesting way that Alla calculates overall karma and individual post karma.
Basically your calculated karma is bouncing between user and scholar, but your post name doesn't necessarily keep up.
I don't know how it is done in the server, but I do know that the solution is to keep posting. Eventually you will be rated up or down enough to solidify your standing one way or the other. To me your karma is 3.01, which means you should have no problem rating posts.
My advice would be if you truly care about being able to rate posts, ditch any group that would give you a potential rate down, and post carefully.
You'd be amazed with only around 250 posts how much your karma can move if someone decides to not like you.