I posted this answer yesterday. Today I see it has 2 upvotes but in the top-right achievements/reputation notification, it only showed +10 instead of +20. I checked my rep history on my profile (TIL this is publicly viewable) and that also shows only +10. So the bug may be one or more of: Upvote miscount: It's actually just one upvote, not two Rep notification error: It's actually +20 but shows +10 Rep history error: It's actually got two +10 events but showing only one of them Total rep sum ...