First of all, I am running with all updates installed.
I released a group of work orders after MRP Generation.  Part of our process is to print up the shortages during WO-B release process.  Then we print up the travelers.  The WO-B report does not match the work orders printed up.  For example a piece of steel correctly called out on  the WO, shows up on the report with another part number as a requirement.  These are simple one level boms.
 
Thanks
Mike