I found a problem with parsing errors on dxf's spline curve. Here uploaded 3 dxf files, you can use klayout and AutoCAD for comparison. You can see that there are problems with spline curve analysis, either with more lines or less lines.

klayout version
0.28.8

dxf with spline
https://github.com/libaineu2004/myepolltest/releases/download/dxf/bo.dxf
https://github.com/libaineu2004/myepolltest/releases/download/dxf/potato.dxf
https://github.com/libaineu2004/myepolltest/releases/download/dxf/R.dxf