QUESTION: Why are there stripes on my rendering?

https://preview.redd.it/wzjjk4v49i3e1.png?width=1920&format=png&auto=webp&s=5f3ae8d845481ea138e7a5b7e53d92100a01f096

I don't understand where these stripes on my rendering come from... Im using TwinMotion path-tracing set on high (256 pixel samples). My graphics driver is updated to the current version. If anybody could help me I would be very much obliged. Thanks in advance!