To replicate, place down string and look at it while facing west in-game. It's most noticeable if you're looking up at the string.

Tested on a GTX 1650 mobile, on driver versions 516.94 and 522.25.
Minecraft version 1.19.2, mod version 0.18 (untested on other versions).

I noticed a bug in 1.19.2 that almost surely caused this. Next build it should be fixed