"Best answer point" error?

I use JomSocial 1.88 for Points System and I have some problems with CA (I test on my localhost). I describe them in example blow.
_ I set:
Community Answers - Best Answer: 5 points.
Community Answers - New Answer: 2 points.
Community Answers - New Question: 3 points.
_ I have 3 users: A, B, C

First, A asks a question. Then, B and C answer.
There are my problems:
1. A chooses "Accept Answer" on B's Answer. Then, A get 5 points (A instead of B). Similarly, if C does that, C also gets 5 points. B gets nothing while B is the person who has this answer.
2. A and C view this question AT THE SAME TIME. Then, they click "accept answer" on B's Answer. ==> A gets 5 points, C gets 5 points, B has 2 best answer and no point while B has only one answer. (Community Answers -> User)
3. Leader Board shows incorrect point. Example: A gets 5 point. So, amount of A's points in database (jos_community_users) adds 5 points, but Leader Board adds only 1 point for A.

Sorry If there are any language mistakes, I'm not good in English. Can you help me?