Bi-directional option causing banding?

Getting banding on tiles using Norton white tile method (no issues during wood cutting or engraving). However, it seems to go away if I deactivate the bi-directional option; enhances the burn time significantly but banding goes away? Tile on Left is bi directional ON, tile on right is bi directional OFF.

Any reason this option made such a difference?

Ortur LM2.
White tile painted white
1200mm/m, 55%, 90°

I moved your post out of the software group because you’re looking at some kind of production artifact and you’ll probably get more response to your white tile question here.

I’d be interested in seeing if you got the same results at half speed and half power.

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