I put a bounty of 100 on the question Has any national leader ever climbed as far as fast as Ulysses S Grant?. I wanted to split it between two answers but it's not possible (I guess I should have checked that...duh). Anyway, I decided to give the 100 to one of the answers I like and then start another bounty to award the other answer I like.
Problem is, when I tried to start another bounty, it wouldn't let me do less than 200 (I want to give 100, same as the other answer I awarded). I don't get it. I've given 50 elsewhere a few times now so why can't I give less than 200? I just want to give the Napoleon answer 50 or 100, not 200.