If you go to this site you can see what I'm talking about. The logo image shifts slightly whenever the backstretch background image fades. Can't figure out what causes this. I'm viewing it through the latest firefox browser. If I apply fixed position to the backstretch div, it solves that issues, but then it's fixed on the site, so you can't see the other content once you scroll down.
What is this problem called? I couldn't thoroughly search for similar questions, because I didn't what keywords would bring this up. Thank you for any advice!