My mouse buttons are making weird noises

Hi, I have an ATK A9 Ultimate. I bought it about two months ago, and it's been working great. However, yesterday I started noticing a strange noise when clicking. It sounds like the plastic is rubbing against something and makes a slight creaking/crackling sound.

It's not noticeable when I'm gaming with headphones on, of course, but it's still a bit annoying. The left mouse button is the one that seems to make the noise the most.

I only use the mouse to play shooters—nothing particularly intensive—and I use it around 2–3 hours a day. The mouse itself works perfectly fine, but this noise appeared out of nowhere. It definitely wasn't like this before.

Has anyone experienced something similar? Is there any way to fix it?

Thanks!