Slug is being changed automatically but there’s no dupe?

I’m stumped, I’ve created pages /miss-usa-2023/ /miss-usa-2022/ etc, no issues but when I try to create /miss-usa-2019/ I keep getting numbers tacked on at the end? I’ve checked for duplicates and can’t find any. https://www.pageantupdate.info/miss-usa-2019/ redirects to https://www.pageantupdate.info/miss-usa-2019-157/. I’ve checked pages, posts and media, the trash, everywhere I can think of. I would have thought I’d have issues with the other similar parent page slugs if there was an issue with 2019 and I really need them all to be uniform.

The page I need help with: [log in to see the link]