Shifting test patter and ghosting


I tried running a test pattern the other day as well as a material test card and was getting weird results. You can see the test grid shifts to the right on the higher speeds as well as ghosting on the letters on the material test card. I was about to start adjusting the belt tension but figured I would run this by the group first if there were other suggestions I might have missed.

I have not used the laser in a few months and when I did, this was not happening.

I tightened up the horizontal belt, but still getting the shifting.
Any suggestions or is this just not able to handle the speed?