I have a collection list which only has one item in it. You can clearly see this in the designer:
On the published site, it’s still showing a previous, but now-deleted item.
I have published the site multiple times since deleting the item. This is a problem in both Safari and Chrome. I have cleared the cache, restarted the browser, and restarted the computer, multiple times. I also updated the browser. Finally, I accessed the published site in Firefox, which had never been used to access the site before and could not possibly have a previous version of the site stored. Same problem.