as always, post a picture or copy of your script.
Is it tied to a trigger that's firing multiple times?
Is it in a loop somehow?
Is your relationship set up to delete related records?
Did you accidentally use "delete all records" to delete your found set?
need more details, the delete record request script step does not delete more than one record unless it's told to somehow.
I got it Mike ist was the Delete related records in this table via ths relationship that I had check in the tables.