First thing I did on May 24th was sack 150 reputation in order to promote discussion on a question (and in turn received a lot more upvotes than actual opinions or answers! What am I paying you guys for?), which put me at quite a disadvantage for earning reputation that day. According to my Activity page for reputation that day, I had a net result of -21 points after 10 upvotes, 2 accepted answers, one cast downvote, and the bounty payment. On May 25th, I proceeded to earn 90 reputation from 9 upvotes over the course of the entire day.
But my reputation audit thinks all of this happened in only one day! All of my efforts on the 24th have been squished into the events of the 25th! Here's the section of my reputation audit for the complete "day":
-- 2010-05-23 rep +10 = 2141
1 50989 (15)
8 50774 (-150)
2 50991 (10)
2 50991 (10)
2 50774 (10)
1 50991 (15)
2 50991 (10)
2 50774 (10)
2 50774 (10)
3 ***** (-1)
2 50774 (10)
2 50774 (10)
2 51046 (10)
2 51046 (10)
2 51046 (10)
2 51104 (10)
2 51104 (10)
2 51122 (10)
2 51122 (10)
2 51133 (10)
2 51133 (10)
2 51131 (10)
2 51176 (10)
-- 2010-05-25 rep +69 = 2210
Where that +69 is equivalent to -21 + 90. It appears that the net loss incurred by the bounty makes the reputation audit skip addressing that day. It shows all of the activity correctly except for actually ending yesterday. So to summarize: posting a bounty and not earning back all of the lost reputation appears to compress time itself and merge days.
UPDATE
As posted here by Gnome, this bug is not specific to bounties. Indeed, not only will any day with any form of net loss of reputation be unmarked, but entire sequences of days can be collapsed at once in the reputation audit. Until the reputation gain is resolved as positive, it will be recorded as the following day.
According to the numbers of the reputation audit (copied below for convenience), 44 downvotes occurred in the span of a single day when in reality they were cast over 6 days.
-- 2010-05-04 rep +10 = 2869
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
2 34394 (10)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
2 34394 (10)
1 45987 (15)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
1 49238 (2)
3 (-1)
3 (-1)
2 45967 (10)
2 45967 (10)
2 44319 (10)
3 (-1)
3 (-1)
2 45995 (10)
-- 2010-05-10 rep +33 = 2902
2 49507 (10)
2 49507 (10)
2 49507 (10)
3 (-1)
2 49507 (10)
2 49507 (10)
2 49507 (10)
2 49510 (10)
2 49510 (10)
2 49507 (10)
2 49507 (10)
2 49510 (10)
1 49510 (15)
2 49507 (10)
2 49510 (10)
2 49507 (10)
3 (-1)
3 (-1)
3 (-1)
2 49507 (10)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
3 (-1)
2 49613 (10)
2 49613 (10)
-- 2010-05-11 rep +176 = 3078
