Need help with wood engraving

I seem to have a repeating issue when engraving on wood.
The square one is from a year ago with the original laser.
The round one is from today with the 10 watt.
Both seem to have random dark issues (The square one is obvious, the round one is in the center.)
Neither was paused or moved during the engraving.
Any idea what can cause this?

Do you engrave from the touchscreen? If not, the connection from Luban is the issue.
Try to print by transfering to the touchscreen first and do so from the touchscreen.

Have you tried Lightburn?