Unless you entered them incorrectly, none of those codes look wildly wrong or likely to cause problems. It's possible some of them are meant to be active only at certain times, but I'd expect to see notes in red font or something in that case.
Really, I'd have to know where the quest/event flags are for the materia to make a guess, and that's not information that's easily googled. You might have better luck elsewhere. If LazyBastard is still active at GameHacking.org
he was pretty deep into reverse-engineering FF7, and might know where to find the information, if nothing else. You could also try romhacking.net, but the question wouldn't be quite so on-topic for them. It's highly likely people there have mapped out every byte of the save file, though.