I was trying to delete a photo and when I clicked on the gallery all the photos were shown as a blank gray and I couldn’t identify which photo was which. I then deleted all the photos in hope I could upload only the ones I wanted on my profile. I then did that and nothing is reflected on my page and even the photos i wanted deleted are still there also the photos are shown rotated incorrectly upon clicking on a photo to enlarge it. I have emailed support and even talked to a live agent and haven’t gotten a response yet.
It is technical issue in their platform. I have the same issue. Just try to delete all and add all at the same time. Then come back to the gallery add the photo you want to use for the gallery. Otherwise random photo will be selected for the gallery.