Somehow nothing works as intended, while it did before

I wrote quite a few functions for my datapack on armor set bonuses, and everything worked fine up until now? I don't know how to make tick or load files, but everything seemed to work without them, and it still does (at least only one of the sets - Snow Ruffian), but Desert Prowler seems to not work. I don't understand why it doesn't work while the Snow Ruffian one works perfectly, even though they are almost the same save for nbt data of armor. Is there some error in code or what? (Files attached in order: checking for set, giving the set bonus, repeatedly checking for set and removing bonus if not found, resetting scoreboard)