I imported a drum map from BFD3 and edited it to re-order the various drums in the Drum Editor. When I load an instance of BFD3 and assigned the drum map I edited, it is replaced by the default drum map that loaded in from BFD3. I’ve attached a zip with screen shots:
1 Custom Drum Map.png - this image shows the edited drum map after loading it into the “Drum Map Setup …” interface.
2 Drum Map assigned.png - this shows the custom drum map assigned to the BFD3 Instrument track.
3 Drum Editor shows default map from BFD.png - this shows that when I open the Drum Editor the original drum map imported from BFD3 is back and has overwritten the custom map.
4 Assigned Drum Map overwritten.png - this shows that when I exit the Drum Editor, the assigned drum amp is now called BFD - BFD3 
I’ve also attached the custom drum map file (BFD 60s Rock Kit.drm) and the file that overwrote the custom one (BFD - BFD3.drm). Both drum map files have the same list of values but the list in the second file that overwrote the custom file has all of the custom ordering returned to the standard 1…127 sequence.
Drum Map Bug Screen captures.zip (1.16 MB)