A page went down and I get a "Page Not Found" error. I tried looking at all existing pages and the page is simply not there. It isn't in trash, either.
However, when I created another page and hit "preview," I could suddenly navigate to the missing page, which works just fine.
I inspected the page and the source reads "www.website.com/?p=480" alongside wp-content and wp-admin, etc.
What is going on here? ((I was careful to copy the ?p=480 file content to notepad just in case it only exists inside of the cache))