We shot this same classifier last match. It was confusing, and the stage description wasn't clear. I remember it not saying"only" in the number of shots specified, because when I got home I read the description on the USPSA website and it was then clear to me that most people shot it wrong. I don't know where the description came from, or if it was old and had since been rewritten? It looked like an official USPSA briefing.
Most people did the same and made up shots on the final string. I think where it said "the best 6 are scored", people thought that you could make up extra shots if you had extra time.
I have taken the NROI class and shoot fairly often, but can't always remember the rules or find and interpret them correctly in the book. It could have been like us, and made an honest mistake on interpreting the stage description.
I think people shouldn't be so quick to judge other clubs. There are many small clubs that don't have the resources of plenty of well educated RO's, GM shooters, or extra help to go around.