Timberline001
WKR
There’s definitely something contacting it during the draw or shot process that’s causing that.
I would peel back that serving and make sure there isn’t damage to the string. The one I just fixed had a single broken strand, my buddy was OK with just clipping it and serving it back in. I would replace them if it had been mine since it’s several months before the season but his bow was new last year and he doesn't really want to spend $125 on a new set.