Hi Sally,
Thank you for the details!
It took me some time, but I believe I have found the cause of the problem. It turns out there is something wrong with the random ordering and the “load more” feature coupled together. The secondary ordering of the pictures was set to “random”, and that seemingly caused the issue. I have changed it back to the default “date descending” here: https://i.imgur.com/wpr0Q3f.png
I did a few test searches, and it seems okay now. Can you please confirm?