I made what I thought was a simple D8 die, and then when I tried to upload it I noticed two of the faces were blank, and did not roman numerals on them. Thinking that was odd, I went back to the model, only to find that the numbers were indeed there.
Upon closer inspection I noticed that the two faced that did not show up when uploading it elsewhere were a lighter pigment in the original model, they were pretty much white while the rest of the middle was grey, and this is not just due to lighting, nor is it due to paint bucket.
I assumed the faces were at a slightly wrong angle or something, so I tried messing around with it, but to no avail. I even tried remaking the model from scratch, and a similar thing happened. I have no clue why the faces are white instead of grey, and don’t know why they act differently. Can somebody please explain what is going on? – and what is the best approach to fixing said problem?