Recently I was running a job with very small text and I wasn’t happy with how crisp the text was engraving. So I paused and escaped the job and turned off bi-directional fill. I started the job back up where it left off using the preview and the engraving was shifted about a mm. I didn’t notice any difference in engraving quality so I paused and escaped the job again, turned back on bi-directional fill and the engraving was shifted back to where it originally was. I made a picture to show you what I mean.
A recent LightBurn update applies that adjustment to both uni- and bi-directional fill. If you’re using an older version, now’s a good time to fetch the latest version.
Show us a screenshot (not a phone picture) of the Scanning Offset Adjustment settings @parsec suggested.