The tool uses by default the EPSG:4326 - WGS 84 CRS. If you project is in EPSG:31467, you can see that the icon of CRS status (right down corner) is now black indicating 'enable on the fly CRS tansformation'. Save your virtual layer temp.shp with the correct EPSG and another name.
I tested this in my system. The temp.shp line (EPSG 4326) produced with the hub distance tool (MMQGIS) is the same as line3; but the latter was saved with EPSG 32619 of my project. After remove temp.shp line and deactivate 'fly CRS tansformation', line3 remains at its position.
