too many errors in the system.
is such a bad thing is available only one withdraw per month with paypal and only by a single account
rebates are shown in real-time as reported by the broker and as such, at the end of the month, if any errors are recognized, only then it can be fixed.
As to the payment limitation - there is no point of allowing a withdrawal more than once per month since rebates are paid on a monthly basis. As to account - you can withdraw once per month per each trading account, meaning you can withdraw all of your rebates every month.