Question about ripped disposable

photos of the red leaf it turned two at abt half full in the tank. Green leaf how it looked when I first got it. so I bought this disposable before and it's mostly fine but I've noticed that it will turn red and not go back to green. I thought it was about the battery but that doesn't seem to affect it. it also hits rougher than before and clogs easier. is there any explanation? I asked the guy I bought it from and he said it's a different heat setting but it's not I've tried to change it and nothing works. no results when looking it up either :/ any help appreciated