Failed DMXImportGDTF of fixture

Hi there, not sure if i’m asking in the right place, but here it goes:

I downloaded a couple of GDTF files from gdtf-share.com, specifically:
Martin Professional fixtures: MAC Aura PXL and MAC Ultra Performance

the Aura PXL seems to load fine, i get all fixture attributes in the asset, but when i load the MAC Ultra Performance the attributes don’t load, see images for example:

The wierd thing is i can’t see any obvious differences in the files when i open them in the online GDTF builder (at gdtf-share.com). I have also used both GDTF files on a MA 3 lighting console with the fixtures connected, both working perfectly.

is this a bug in the GDTF importer in Unreal Engine 4.27.1-17735300+++UE4+Release-4.27 ?