Textures not exporting properly

Textures exporting without some materials showing. This was working fine a couple of days ago then suddenly part of the texture became nothing but white. I have'nt altered anything in that texture set, just had it exporting with others. Tried exporting from another save and ended up with the same result. Any help is appreciated. I am very new to Substance, downloaded 3 days ago.

Pictures are of what I get and what I see in the program.