Just fixed a file (yours?) on the support queue by:
- opening in Inkscape
- fixing all the non-closed paths
- re-saving as SVG
- importing (but the open-ended paths were left out)
The community has notes on this sort of thing at: Shapeoko CNC Router, Rigid, Accurate, Reliable, and Affordable
it may help to use the OVERKILL command to eliminate any overlapping or intersecting paths before exporting from AUTOCAD
AutoCAD 2000 DXF format (model geometry only, base model scaling) export from the desired face (not isometric view)
2004 Lines
it would be nice to have a similar set of recommendations for Creo, but I’ve put your file in to have a developer look at it.