Okay, thanks for the quick reply. I've done more tested and I can guarantee this isn't a simple graphical bug (on my side at least). It seems the cause is jumping into lava with the volcanite amulet. It lets you swim but when you jump out of the lava the Rending Gale seems to think you are in flying mode, but you are not. This causes it to change to blue and it refuses to turn red, just blue or purple. Even if it is purple it doesn't push away mobs or launch them when right clicking. One way to fix this is dropping it on the ground or picking it up and replacing it back into your inventory. BUT, this sometimes doesn't work, and the best way to fix this is by just deleting the one you have and spawning another one with Too Many Items. I suggest picking one that is already colored (not just the normal one) because it seems sometimes it picks back up what the old one had and starts glitching immediately. After that, the first fix should work if it ever bugs out.