Lasercut 5.3 -MPC6515 vs wrong position

I have a Chinese laser with an MPC6515 controller and have used it for some months. Something changed today, and I'm not sure what.

When I cut many layers,the first layer was fine but the second layer started running from the end of 1st layer rather than where the file tells it to be.


Thank you for the group and for your help!

Anant

there is [simulate] button on the top tool bar. You can click this button to see machine working parth, before click the [start] for real proces