These users are shown to have deduction in reputation but there are some mismatches
46845
Trying to hide spam/offensive deletions on user profiles announces them
68789
Why does du and quota results not match?
8338
Serial downvote reversals don't always appear as such
16670
Removing a downvote adds reputation that wasn't there
94730
Wrong reputation calculation in achievements dialog
144724
Per-tag breakdown of reputation in answers
26142
When a user who approved an edit is removed, an incorrect "-2 reverted" event appears in reputation history
98831
AND OR causing more results to appear than should
20508
reputation points gained in answers
27537
Why is my total reputation less than my monthly reputation?
99759
Deleted users still leave some trace behind
101134
Bonus Reputations for starters, new users
116625
Order by reputation appears to be broken in users page
33185
What does SE use to calculate reputations? SQL aggregate functions? A manual method?
57403
Inaccurate reputation graphs - bug or as designed?
110665
Top user leagues shows wrong top user
47011
A small bug in recent reputation changes -- since when 25+1 = 24?