Wanted to engrave powder coated tumblers using rotary chuck.

1st attempt worked flawlessly. Picture provided.

(Picture shows beginning line for entire burn with ‘EST 1972’ being the very LAST thing that gets burned)

2nd attempt using same settings however gave this result >

(Picture shows clear ghosting of image, 2nd pass using IR laser begins entire burn several mm away from blue light burn, then correcting itself after maybe 1-2 inches of burning to line up perfectly with first burn for remainder of design).

This happens again and again. 3rd Tumbler image provided.

(Picture shows same burn parameters with visible ghosting at beginning of burn correcting after a few inches.)

Now I thought it may have been the IR Laser causing the issue (even though it worked perfectly first time), so I did a pass using just the Blue Light for x2 passes. However. Same. Issue.



(Picture shows Blue Light passes burning inconsistently for several inches only to course correct for remainder of design).

So it's not the Fiber Laser!

I watched the 2nd pass begin and caught it not even beginning the burn on the same indicated line as the 1st pass.

So my question is. What is causing this? Is my chuck loose, defective? Is it software related? Nothing has changed from what I can tell for the 1st flawless burn to cause this issue. And why would it so clearly -fix- the burn after just a few inches of being completely off? 

Complete settings listed again just in case you cannot view the images. 

BL
Dot Dur. 260
PR. 1-100
DPI. 206
Pass 1.
Grayscale
Bi-Directional

Then after that runs I do a cleanup pass without touching or changing anything besides the burn parameters.

Fiber IR
Dot Dur. 280
PR. 1-60
DPI. 150
Pass 1.
Greyscale
Bi-Directional
30khz

xTool Creative Suite for all burning work.

Laser is inside garage, it IS cold in there, but not below freezing.

Nothing I can think of that would consistently knock the laser off-kilter every single time?

Any help would be greatly appreciated.