Material strange indexing

I have a strange problem with indexing of my material I use two basic and one dynamic m! Vecause it uses a dynamic m requires index of the material and on every model or on instances of that model and LOD too is on different place (messed up) I have defined in maya first material Bodycolor and second is Glass
Probably is a bug in Ue4 or Maya
or maybe I just somewhat misplaced
like how define number of the material
Sory for bad English