The issued payment is less than the revenue shown on the stats page. When I looked at the support help pages, I found this Does anyone know how long can it take them to pay those funds(it says above that it will be added to the next payment, but it never was) and anyone else having the same problem who is using Adbrite?
You should contact their customer service and ask them about it, they are the only ones who can give you a definitive answer. I'd say those funds are gone though.
yes it's uncollected payments from advertisers if you click on earning and click on the question marl (?) it will show you how much dollar they took away my last check got 6$ off because uncollected payments from advertisers