XTOOLS F1 Ultra

Hi, i am new to laser engraving, need some help. We have F1 Ultra and i want do some deep engravings, as i have to use fiber laser i work with the buttons “start and save G-code”.
My issue is that laser sometimes jump to a random start point and starts the engraving somewhere like 20mm to the side.
As i using Fill in my Layer that problem is happening to me. As soon as i start doing layers with the Offset Fill, it makes what it supposed to do.
But the problem is that i need those layers be done with a fill command, and it has already worked, but right now it doesn’t.