Yup, I found the problem. It's going to take a couple of days or even more to fix it, but since a bigger change in our calculations might be needed, we might even consider waiting for the Allstar weekend or even the start of the next season to implement the changes.
There's something you can do, actually. Changing the arena size by 1 seat (which you have now tried to do) will not help, I'm afraid, but a bigger change in arena size might help somewhat, and since I can't give you the actual numbers, it will have to be left for you to find out for yourself.
What's going to happen after we revisit the code is anybody's guess at this point