90 degree scan results in duplicate numbers

while eching a test pattern (20 x 20 mm)
1200 mm/min 50% power
363 DPI (0.07 mm)

when doing a 90 degree scan the numbers are duplicated
standard horizontal scan no issues
rotated image 90 degrees and do 90 degree scan no duplication
I realize my beam is football shaped
approx 65 x 100 microns and that the fat part of beam reduces clarity when doing 90 degree
I tried with overscan on and off no change
see test pattern and scans

90 degree scan rotate 90 degree 90 degree scan horizontal scan 2

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