We use Coreldraw to Sheetcam to Mach3. When we draw what we want in Coreldraw and import it to Sheetcam, Sheetcam adds extra nodes and the drawing doesn't look as smooth as it did in Coreldraw. Curves aren't smooth, fonts seem to be the worst, etc.
Yes we reduce the nodes. Yes we use SVG.
Once we run the file on the table the cuts are jagged and not smooth.
Why is Sheetcam adding extra nodes to the file from Coreldraw and why the jagged edges?
I get some strange things occasionally between programs also. Like metalfixer suggested, export as a different vector file type. I would try DXF, AI etc, and you quite often can get satisfactory results with one type over another. I personally found that I get errors occasionally with SVG and sometimes DXF imports into Sheetcam, but when I export as .ai files and load them in Sheetcam they are fine. Test them all, even export as different autocad version types if you have the option. You may find the combination that helps.