Is this a bug?

I used blender for a long time and never seen before those weird lines…
Is this a bug or maybe I just messed up something?

It’s certainly not normal. Might be a bug, might be a graphics card issue. Run some benchmarks on your GPU and if it is fine, file a bug report.

In addition to the above, your Cycles Render Device is grayed out in the Render Properties Panel. Try configuring it in Edit > Preferences > System.

Solved!.. The problem was that my display was using my integrated graphic card, thanks for the answers :smiley: