During the past week or so, I've gained 15 reputation on Area 51 (5 today, April 24th and 10 on April 20th). However, the top-bar reputation button does not show this gain (like it did, e.g., show the reputation I gained on StackOverflow).
Developers, please advise if there's any other information I should provide.
According to the answer on this thread, seems my description of the bug report was not clear enough, so I'll attempt to clarify. The issue isn't that the reputation is not calculated correctly, it is that these gains are not reported in the topbar.
In this screenshot, the "Yesterday" section contains reputation gains in SO and MSE. It doesn't, however, show the +10 reputation I gained on A51.