I'm pretty sure that yesterday my rep was 9489. It then changed to 9499 and later to 9497. I didn't get any notification. Are there recalculations running?
Yes. These recalculations have to do with the recent deletion of an account with a very large number of votes. Initially the user's votes were deleted (as usually happens), but they were restored several hours ago. The reputation timelines of the affected users were amended retroactively.