It's likely that when the Multi-Client Billing (MCB) module was loading the bills, the time recording was edited by a user, before the MCB was posted.
If you encounter this issue, then you can manually reverse and repost the bill on the affected matter, this will not affect MCB Bills posted to other matters,
The steps below are a guide to revering and reposting the bill, and are based on the MCB bill being paid once you have completed Multi-Client Receipting:
From the matter ledger screen, locate the credit/s paying the bill and double-click on them.
Click Payment Against.
Hover the mouse over the highlighted allocation, right click, and select Reverse Allocation.
The bill should now be showing as unpaid.
Before reversing you should consider the Date and Period you wish to reverse the bill in, please be mindful that you can only post the reversal in a period that is available to you which can be found under Nominal Ledger, Transaction Periods.
Once the period has been set. Double-click on the bill on the matter ledger.
Select Edit Transaction.
Set the date to reverse then click Reverse.
Go to Client Postings and select Bills from the drop-down menu.
Repost bill picking up the new amended time recording.
Go to Client Postings and select Allocations from the drop-down menu, then allocate the Bill to the posted receipt.