Looks like it's working as intended to me. Normally you've got enough room for 16 equipment items on the page, but if you only go one or two items over that then they're shown on the same page instead of adding a "more" line. If you go three over then they're moved to the next page and a "more" line is added.
I can't see any items missing or anything like that.
The order looks the same to me apart from the insertion of the new item and shifting an item from one column to the other to make room for the "more" button.