Dot at the start of a scan line issue?

I have been upgrading my machine from a 50watt to an 80watt and installed a new cloudray power supply and laser tube I have cleaned and aligned all the mirrors and the laser seems to pulse and cut perfectly fine but there is an issue when it comes to scanning. When I am scanning it seems that the laser adds an extra dot to the start of the line or is powering up, turning off then powering on to engrave the line. Does any one know why or how I can fix this? See image below.

Any help will be much appreciated.

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