I have 4 GTX 1080TIs running. I'm completely new to mining, so is it normal, that Bminer displays GPU1, GPU2 and GPU3 in the console window with sol/s increasingly, but doesn't show GPU4? After GPU3 total sol/s is displayed and a new job is received.
As i'm away from the minee, I can't upload a screenshot, sorry.
Usually miner software products are referring to first card as GPU0. If you see only 3 cards in the console window, make sure your drivers are detecting all cards. You may need to check your config too. Sometimes, we make mistakes by missing easy steps.