Hogan does a good job of enforcing the rules for their brackets.

The U13a bracket is age cutoff of Sept 1, 2001 Birthday or younger consistent with US Lacrosse rules (both NC teams fit that bill) grade is not relevant.

The 2020aa bracket is boys who will graduate HS in 2020 and can include reclassified players essentially making it a U14 equivalent.

A 2021 team of mostly u12 players is playing up in U13a and should be commended win or lose. If you lose, you should not be bitter about it. If you win, you should win with class and not make up tall tales about your opponents.