Has this happened to anyone else?
I experienced this for a little while when I first played on my new laptop back in April, messed around with graphic settings a bit and it went away completely. Now it's back, and I don't know how to get rid of it. I haven't changed my settings since then.
It only happens in 2-3*, but that's a bad level to have this kind of distraction. And it happens throughout the entire level, not just in the updrafts. Distraction aside, the gameplay isn't affected.
*When playing on Chromium. I tested a bit on Firefox, and found the same glitch happening in 2-2, but not 2-3. Firefox felt kind of laggy, so I wouldn't want to switch to it in any case.
Edit: I seem to have fixed this by reducing my display's refresh rate from 120hz to 60hz, so if anyone else does have this issue, that's a possible solution.