Could anyone tell me why my circles do not come out round anymore?

I have a Weike Laser 900 x 600 running Lasercut V5.3 on an MPC6525 controller.

All of a sudden I can not cut a round circle anymore?

Is there some setting in the software to fix this?

If anyone can help I'd appreciate it.

These are my current settings.

My Original Settings1.png
My Original Settings2.png
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My Original Settings6.png
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Attached Images

• My Original Settings1.png‎ (30.0 KB)
• My Original Settings2.png‎ (32.9 KB)
• My Original Settings3.png‎ (28.7 KB)
• My Original Settings4.png‎ (29.9 KB)
• My Original Settings5.png‎ (29.5 KB)
• My Original Settings6.png‎ (29.0 KB)
• My Original Settings7.png‎ (26.0 KB)