I don't know what I did, but I also changed itemID 1219, saved it using the "Compact" option (redirecting indexes) and it worked. I didn't need to do that layer thing, but maybe it'll be better if I did. I'll look into merging the layers.
EDIT: I have merged the layers, and now it looks a lot better. It's true it only reads the first layer in the game, that's why the last frame of the attack doesn't show the weapon, only the swish effect. Thank you again!