Under Settings, Entries, Double Entry/Patterns, I've selected no double entry.
At least 3 schools have been successful in double entering students. Huh?
The No Double Entries options on the patterns pages are working for the majority of tournaments. Is it possible the entries were created prior to your setting the option to disallow them?
Please email firstname.lastname@example.org with your specific tournament information and we may be better able to assist you.