Hi axford74,
for georeferenced project it depends what do you have set in the application settings as Project and Output coordinate system:
and also which settings are used during export (this is mostly applied for the models).
Have you tried open the DXF file also in some other application (like DWG viewer)? If so, it the problem the same?
It is possible that your application doesn’t support georeferencing or as it is a project from a drone, for georeferencing there are mostly used lat/lon coordinates, which are using degrees and it can mess your exports.