D5 has its own co-ordinate axis system in place when importing a model in file. As per this explanation:
Working with variants (D5 2.5.1.0319) - #2 by Bruce.W)
Request to implement natively the origin point of the “imported/d5synced” fbx/dae/obj/abc files “origin x-0,y-0,z-0” co-ordinates into d5 so we can work easily and we don’t have to keep doing a lot of mathematics for finding the moving files each time. And each file will be imported as per their origin point.
Work around for it also posted here:
https://forum.d5render.com/t/d5-render-variants-workaround-asking-for-help-opinion/26100/2?u=genesisplanners
Thanks & Regards,