I noticed a drop in my reputation today. Not that I mind, I have plenty, so I am asking why did it happen purely because maybe it is because of a bug. As far as I know reputation can get down because of the downvote, or because the person who chose the answer decided to choose another, or somebody decided to retract his or hers upvote. Although in the latter case there is some kind of lock after some period, so you cannot downvote if the answer did not change. My reputation dropped by 40 so this should amount to two reasigned answers and one retracted upvote. Not very likely for Sunday, hence the question. If this is a bug please retag.
Reputation score is denormalized, so it is expected for it to vary slightly from the "real" value over time. We periodically recalculate everyone's reputation to bring it in sync, roughly once per year.
Some ways reputation can be affected without being updated live:
- a user is deleted; this deletes all their votes
- a post is deleted
- a post is migrated to another site
You can always check
to see the live calculation of your reputation, and optionally recalculate it to reflect the current, most correct, value.
We did a global recalc across all Stack Exchange sites today in preparation of some new features.