I have the same problem too, performance is calculated based on initial deposit + competition rebalance.
Actually there's an easy way to see which competition accounts affected by this error. On the competitor list page, look for performance line graph that doesn't start from lower left corner of performance box.
I've had the same problem, send a mail to the staff to point out your account and they will reset it, just be patient i think they should be overworked by now.
Guys have you noted that most of the high performers disappeared? =P i can't believe I jumped overnight from 36º to 16º place!
This is turning really interesting!
Nice weekend to all of you.
Mental note: do not abuse.