I’ve noticed that, from time to time, my total reputation points are changed, generally for small amounts: 5, 10 or 20 points for instance. The issue is not the adjustment itself but I wonder how that comes about. There is no evidence of these adjustments in “reputation” or “votes” summaries such as “user was removed” and the like. Apparently no visible action was taken.
So my question is, are there reputation adjustments possibly made by the system, probably on old posts, that result only in the change in the total reputation count without any visible action to users?