Thanks guys! What teiV suggested worked for me. I deleted all the _wp_old_slug files that were associated with the permalink/slug in question.
I didn’t know how to do this at first, so I had to do a little research. For those wondering, this is how I did it:
I went into the WordPress database. I did this by logging into my cPanel and navigating to the “phpMyAdmin” option.
I was taken to another screen where I saw that I had two databases. My databases where located in a panel on the top left hand side of the page. I selected my WordPress database (the one with “wp” in the name).
I was then presented with the WordPress tables. From there, I did a search for “_wp_old_slug” and was presented with a list of my old slugs. When you search, make sure you don’t leave out the first underscore in “_wp_old_slug” because that makes a difference.
In the search results, I selected and deleted the files whose meta_values pertained to the slug in question.
After deletion, I tested the page in question and it’s back to normal!
