Blank photos in my albums

A few weeks ago I added a photo to my album from my own photos but it wasn't loading so I continued to add it and now I have these blank photos that won't go away (in the area where you save the photos to your album not the actual album itself). I fixed it once before but i can't remember how I did it. I tried just saving them to a random album and then deleting them but they just reappearing when I click "add photo". If anyone knows how to fix this I would really appreciate it!