If you are really interested, you should read up on the "Skating" system of marking.
You should try a search for "Skating system rules"
Those of faint heart should not bother!
As QS7 said, it is a countback scheme resolving couples who tie for a place.
it would be difficult to comment on individual cases without seeing the score sheets.
I was once asked to consider learning the system. I wonder if there is a demand for scrutineers?