Bert,
After setting your job in Corel you would normally export as DXF and import into your other software that controls machine.
What version of DXF you select on export? Try different format and save the file on desktop, close Corel program and reopen it than import the file in to Corel.
Do you now have 20 circles or is there multiple stocked up. I'm trying to isolate if your other program on import multiplies those circles since no one else has this issue with Corel.
Trotec Speedy 300 - 60w, with Quatro CSA-626 fume extraction
Xenetech 1625 x2,
New Hermes TX pantograph, CG4 cutter grinder
Brady Globalmark2 label printer,
Assortment of custom tooling , shears & punches, heat bender.
Software: Xenetech XOT, Corel X3, Bartender label software