Laser zigzags while cutting curves using LightBurn

Hi, I am using free trial LightBurn and I like it very much. However, when I try to cut shapes like a simple circle, laser head start to make small zigzags in a shape of drawn circle. I have RdWorks also installed on my computer and the latest version works good and cuts all the curves as it supposed to.

Any clue what it is wrong? Thank you.