This was my first time using this particular camera (Canon AE-1). The images are double exposures. I was shooting concurrently with my other AE-1, and those double exposures turned out fine, so I don't think it's a technique issue. When I rewound the rolls to reload them before the second round of images, one of the rolls got stuck on frame 8 and wouldn't rewind anymore. I messed with it for a few minutes, and I don't know how, but it eventually started to work again. Unfortunately I don't remember which roll got stuck (this weird one or the good one). But I'm thinking that if all of the frames have the white bars, it was not caused by the film (possibly) getting stuck. It must be a camera issue. Any ideas what would cause this?