Blue question mark overlay in header / Safari only
I am not much of a Magento pro (still learning) but I have to work with it anyway for one of my clients. I can't contact the original developer, so I turn to the community for help! I have a problem with the homepage header image slider. When you use safari to visit the website, at the first time loading, it shows a big blurry overlay kind of picture of a question mark and I have no idea what it is or how to fix it. I have tried reloading the pictures of the banner, but no luck, thinking it might have a damaged file, or just could not find the file. As I don't really know what I am doing, I have no idea where to start looking. My client uses safari, so they see it every day. Can someone please help me with this? Thanks ever so much!
I think the website is updated (ish) we did that a few weeks ago, but the problem was already there before that.