Weird shader bug

Hello i was testing some shaders on my new pc and i noticed some weird "bugs" that appear with every shader, what is causing this and how can i fix it

shader: FastPBR v1.1



How my shadows and idk look: https://imgur.com/a/WeKwx1U

              https://medal.tv/de/games/minecraft/clips/1WN7zAycA5-eJI/d133759mimEz?invite=cr-MSxKYlYsODA2MDU1MjUs



Edit: The create Elevator or all create contraptions seem to "glow" as well