Newbie needs help….circle turned into an oval

Hi there,
I am hoping someone here can help me or point me in the right direction on what I need to do. I am working on a project and I wanted to cut 4 circles. During my prototype, the circles were fine on the first run. I saved my project, shut my laser off, and started it back up. I highlighted the things to cut and this time instead of cutting circles it cut ovals. I am using an Azter P20 if that helps. Just to recap I cut the circles, saved the file, shut the laser off, turned the machine back on then it failed to cut circles.

Thanks in advance