Lines when don't line up when engraving

when engraving small text letters aren’t consistent in width.
scanning offset is calibrated but when open spaces vary in size a offset appears.
i have no clue how to improve on this issue and it changes with speed and with distance in gaps.
even though in some of the pictures it improves with higher speed it can get worse when the shapes are different (the gaps size between the line changes).
when just engraving a square the lines start and stop without offset.
does anybody have any clues?

This one shows even better at 200mm/sec random text first the lines are aligned until the text comes behind the square.

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