Using chuck rotary to engrave wraps - getting “skipped” places

Ruida controller AP Lazer. Chuck rotary
I am learning howto engrave wraps around tumblers. Was able to successfully finish one yesterday but when I examined it afterwards, there was a very thin line from top to bottom where it didn5 engrave. It’s not a seam.
This happened a few times with a different practice design earlier in the week.
Very frustrating.
Any recommendations?

(I can’t figure out how to upload a picture of it)

You can drag and drop the picture into the reply box here or use the upload Icon (up arrow from desktop box) at the top of the reply box to browse for the picture.

I confess, sometimes I’ll email the pic to myself from my phone so I can open it on my desktop computer.

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