At the bottom of each item page, the “More items by” section supposed to show all the items of the author except the current item. But now it shows current item and due to the same reason missing atleast one another item.
Looks like this issue happens just recently.
When the number of files of the author are less than 7 (when showing blank thumbs), it still missing to show one item but shows current item. Probably it randomizes and selects from the list before excluding the current item.