Distortion when using Fill

Hi . Hope someone can help. I have been trying to change the Scanning Offset Adjustment with not much luck. I have a chinese Red & Black 100 Watt. This is doing my head in. I can engrave fill other text and images ok but now and then i get this? You can see the dates to remember and Dogs sign that was done with fill and its fine. The Emporium sign was filled at 100 mm/Sec and its about 700 mm long that should be slow enough ? I Installed the Barn Font from the Net would that have anything to do with it?. Do you think its a machine problem or is it something that i have done wrong in Lightburn? Do i need to be more patient trying the Offset adjustment?
Thanks
Graham



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