This is something that should be easily caught, at least with a job that runs against the database if it's difficult to make something that runs in the UI.
Any changes to the Rx workout should be trivial to catch - the Rx button doesn't appear if the workout is changed. The Rx/Modified buttons make for a confusing workflow when the workout can also be edited by the user and still marked Rx.
If you look in the top 20 of i.e. front squat 1RM you'll see not one correctly logged workout, because the score is always the sum of all reps and sets.
But for a 1RM the score should be just the max weight of all the reps...