JPG/PNG strange export for screens

I am trying to export multiple artboards for screen to jpg or png. Things that I have some quality but jpg results are veeeery weird. Like distorted pixels or something. Export Worked totally fine. Not sure what happened. Another classic adobe frustration that kills my productive day. 

Tried in latest Ai 2025 + 2026. Thanks.

This is ok (A4 format, cmyk)

Here is more obvious

Artboard 

Export JPG 100 (100% zoom) Look at the lines.