Double line on engraving/burning text

I am using an Xtool Di with a rotary attachment RA2 and Lightburn software.

So, I have been testing engraving/burning on round stock. Seemed to go well at first, but then it changed to double lines and I have no idea what changed all of a sudden. Searched on previous similar issues, but could not find anything that helped me
I am burning text in “fill” mode when the problem occurs. In “line” mode it seems to be OK.
I attached a couple of photos, one with my settings and another showing the problem. Look at the letter “K” on the right and one can see the double/shadow lines. Any on what to look for is very much appreciated.

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