Whenever I gain reputation, I get 4 additional reputation. See this picture:
This picture is captured when I gained reputation by +5 (for upvote on my question.). Before I gain +5 reputation, my reputation was 2,211. And after I gained +5 reputation, my reputation became 2,220 (as shown in the above picture). But when I refresh my page the real reputation is shown like this:
So the problem is minor. But why do this happen? I suspect this issue might be related with this issue.
EDIT: I do not face this issue in the case of downvotes.