This might be to do with the set up of the fee earner in Handler Maintenance not brought through before time is posted.
You can move the time in the SIB posting which will rectify the problem:
In the SIB slip click on the allocation box and then select VIEW WIP & SET NOMINALS.
Select the fee earner line you wish to move and is not allocated correctly.
Select MOVE WIP LINE.
The system will ask you if you are sure click YES.
Select the Name of the same fee earner and make sure the correct nominal/profit code is showing.
Click SAVE.
The line will have moved to the same fee earner that has correctly got the nominal attached.
Also this might be a problem with negative WIP having an over allocation of WIP from a previous bill.
To rectify you would either need to reverse the bill with the over allocation and repost with only the WIP available or you can post a positive time entry for the same value to mark against that difference.