Question

When user's points is same, pagenation of users page is strange.

Answer 1

It seems to be a potential bug of Q2A.
qa-include/qa-db-selects.php :: qa_db_top_users_selectspec()

NG (Now):
SELECT userid FROM ^userpoints ORDER BY points DESC LIMIT #,#

OK (Fixed):
SELECT userid FROM ^userpoints ORDER BY points DESC, userid ASC LIMIT #,#