The check amount matches what is shown in their payout stats. It's the commission that is wrong, sales * commission does not equal the payout amount. Up to 2 periods ago it was spot on (save for +/- one cent for rounding)
This is the "explanation"
"Don't worry about it, this happens all the time. I get overpaid by a couple
of dollars all the time, it's because the accounting needs to make the
numbers "more round" not to cause too much errors."