If Monarch isn't including this last record in the shaded data set in the report window, then something about its structure is different than the structure of the other records that are being included using the same trap.
Of course, determining what that difference is having only seen one aspect of the report is impossible.
What's included in the trap line of your detail template? Can you post a representative sample of some of the other records here?
Do all of the work centers have the AAN structure? Maybe you can use LAB: or FIX: as a floating trap?
In order to include this final record along with the others, you'll need to revise the trap so that all of the detail records for the work centers play nicely with the rules that you define in the trap.