Print settings changing after sending print file?

I run a laser engraver with CorelX8, and quite often when I send a job to laser with the print option of "As in document", it will change at some point after I've hit print and sent out the job. So when I go and run the file on the laser the size and position is all screwed up because the selection "As in document" has been changed for some reason. Has anyone else run into this problem?