Fuckin' Apple.
If you're using Safari as your browser, I've noticed a bug. (A bug with an Apple product? Impossible!) If you refresh my page, the header image (which is supposed to randomly select an image from my library and display it) doesn't refresh. I haven't tested this with IE or Edge (and really don't have any way to, since the only place I have access to those browsers is at work and my site is blocked there, so any of you IE/Edge users please let me know if it's working) but it does work fine with Chrome.
UPDATE: Well apparently it isn't a bug after all. Refreshing to get a new header only works when I'm logged in under my administrator account. So I don't know how the refresh thing works now. Is there a time limit between new images? I guess I may have to contact the template designer for clarification.