Refresh makes images disappear, then reappear

I was appreciative for the help I found here previously, so I'm thankful for that. I have my album set up, and I have come across an issue that I have not been able to find referenced elsewhere in this forum. When I first load the album page, it appears just fine - as it should. If I refresh the page, however, I notice that the images all disappear as if they had not been uploaded. If I refresh again, they reappear. This is very consistent - it will do this every time, back and forth, without fail. I have visited the album from different browsers on different computers running different OS's, and it seems to be a universal issue.

My problem last time was a simple one to answer, so that's why I didn't want to report this as a bug until I'd heard from someone here. Thank you very much, again :)