I have a homemade cabinet incubator with a really big fan and i the temp does vary from spot to spot so definitely can happen.I've read that since quail eggs are so small they lose liquid in the egg faster than chicken eggs do. I guess the only advice I can give is have the relative humidity a little higher throughout incubation than you would for chicken eggs. Hope that helps.
That's what I was thinking. I have a forced air but I'm not sure how well it was circulating. I think next time I'm gonna move the eggs from the outer edge to the middle every few days and see if that makes any difference.