There is a programming error in 10.0.3 drag’n’drop
Following @CherylC 's procedure on the same databases that she submitted, I was able to recreate the problem where a transferred person was assigned a different set of parents from those he had in the originating database.
FAMILY is the working database of which DB1 is a copy into which a Nancy Farr and her descendants with spouses was drag’n’dropped from DB2. She was merged in that process with her duplicate in DB1. Duplicate Search turns up two Rayburn Alton Rogers: RIN 36880 in FAMILY & DB1 and 43880 newly created in DB1 from 24261 in DB2. DB1’s new 43880 was assigned new parents from DB1 instead of his parents from DB2. He shouldn’t have been assigned any parents because he is only a spouse of a descendant of Nancy Farr.
There is no record in the ChildTable of the pre-dnd DB1 for a ChildID 43880 so this is not a case of a pre-existing phantom record. A closer look at the parents shows the RINs of his parents in the source DB2 (24280 and 24281) have been carried over into a new ChildTable record for 43880 in the target DB1 when there should have been no such record created. Those RINs are for different people in DB1 than in DB2, hence the strange appearance of two females as the parents, of which the mother died as an infant long before their son was born.