The dots pattern has absolutely nothing to do with the machine - it’s only to measure the distortion of the camera lens.
That said, with the shorter distance is the image in focus? (The camera is manually focused by twisting the lens). Is the image facing the camera? (It has to be)
These things are covered in the documentation - have you read that?
https://lightburnsoftware.github.io/NewDocs/UsingACamera.html
There’s also a FAQ on tips for getting good calibration here: The camera doesn't find the lens calibration pattern (no pattern found)