When using circular array on several different projects the rotated shapes don’t connect fully with the circle.
In the first image I rotated these lines along the inner circle.
Circles in LightBurn are represented by 4 Bezier curve (one per quadrant). It’s not possible to perfectly represent a circular arc with a Bezier curve, so it’s very close, but not exact. On a 200mm circle it should be off by no more than about 0.05mm.
Since your second image isn’t showing any grid lines at all, you’re zoomed in quite far, so I suspect that’s well within the tolerances we expect.