Mass Payment doesn't show correct result even though paypal payment is properly performed

I searched but couldn't find the answer for my problem. Please forgive me if this post is duplicate.

When making a mass payment (admin/store/reports/seller/custom), the payment result doesn't reflect the full payment even thought the paypal transaction was processed intentionally (for the full payment.)

After testing with a seller with multiple orders made, I have found that mass payment influences not the all orders but only one(maybe first) order and the result still includes 'total commission' left although the intended paypal transaction is processed properly.

So, I have changed a bit of code : mp_reports.module (line #282)
* Before : $order_list = substr($order_list, 0, strlen($order_list - 1));
* After : $order_list = substr($order_list, 0, strlen($order_list) - 1);

It looks to me like the case is resolved. Is there any more work left to fix the problem? I just want to make sure.

Thank you.