There is a pdf for importing DXF to front panel express:

https://www.frontpanelexpress.com/downloads/manuals/FPE/DXF-Import_EN.pdf

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The panel is 3D. There are lots of lines/curves.

To look for the source and correction of whatever the export/import "problem" is, an alternative would be to use Rhino to create the DXF (???)
There seem to be a lot of permutations.
I have no time to play right now :-(

- Brian