I am looking at my reputation page and I noticed that the history does not seem to be in the correct order:
How are these ordered?
Should they not be ordered by some chronological time?
They look to me like posts are ordered by total reputation from greatest to least.
When I select the Time tab I get mine ordered by time, but if I select the Posts tab, they are ordered by total rep (total up the + and the -)
Guessing that may be your issue - your link certainly goes to a Post-ordered page