Ridge on acrylic cut edge (between start/end point)

Hi, could anyone please help me out.

I keep getting this little ridge on my cuts, designed and cut using LightBurn. I’ve tried changing so many settings.

I feel like it mostly happens between the start and finish point/joining. This has only just started happening the last 2 weeks or so, no issues beforehand.

Thank you.

(3mm acrylic, elevated off the bed with magnets. Auto focus done. I’ve lead in/out is off).

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