The first page of my unordered list was overwritten by entries starting on the fourth page. They continued to be overwritten item by item until the end of my list. Something like, items 1-60 items of my original list were replaced with my lists' items 400 to end of list.
This likely happened while I was deleting items, possibly dupe items on different pages, and saving the page, changing pages, deleting items and then save and finishing. Either way my backlog now has a bunch of games listed twice and the first page are for the most part dupes of later entries.