Looks like I've found a bug.
I've got 303 rep on Aviation, but it's showing me at 202 on the Users list.
I guessed the 101 difference was because association bonuses don't count, but it did for another user.
Here you can see I have 303 in the top bar, but 202 in the leaderboard (the assoc bonus didn't count).
Whereas for @Qantas 94 Heavy, the association bonus did count:
The rep's are off-by-101 in some cases, and are off-by-1 in others.