Missing Panels when setting up Mosaic

I am setting up a Video Wall using (2) NVS-810’s. I have used this setup in the past but now for some reason I can only see 8 out of the 12 panels when selecting my wall layout. I can see all 12 panels in windows regularly, but only 8 when I am in the Mosaic menu. Mosaic shows GPU’s 1, 2, and 3 with 4 panels each, but it will not give me the availability to select 12 when I move forward.