Actually, for me the end of season report card script at https://kiokizz.github.io/Splinterlands/seasonReportCard actually wasn't working. Did you have the same issue?

As for the brawls, the rewards are a bit opaque to me. Our guild (Team Possible) also won its brawls, but we ended up with only 3300 merits. Is that perhaps the case because your guild is competing in a 3 star league and our guild in a 2 star league?