KS1 SE printer stopping on laying each row causing a seam.

I have just purchased a KS1 SE and am very happy with it. I use Designspark to create 3D models. There are no errors on the design and no errors signposted on Creality Print when I slice the model. The print result is far better than the Creality Ender 3 (my last machine). However, when creating a Cylinder fin, there is a seam down the outside. Looking at the slicing, the machine stop at the end of each row then restarts.

Does anyone here know why this happens and how to overcome it?

Thank you.