Hello krogers42,
Do you have Metashape project georeferenced? If so, which export settings you are using for mesh and DEM export?
By default mesh export is performed in Local Coordinates, so you may need to choose the same coordinate system that is used for DEM. Note, however, that larger coordinate values (like hundreds of thousands and millions meters/feet) may be not interpreted correctly in external application, so I could suggest to use Offset value on export to subtract fixed X and Y values from the mesh coordinates and then add the same values (if supported in external application) back on the mesh import.