‘Ghost’ pages

Hey,

I was wondering if anyone can help.
I’m unable to edit the URL slug on the relevant pages to just /videos and /music as it would appear there are already pages using those URL slugs, so it auto changes my URL to /videos-2 and /music-2.

Problem is, if I look through my ‘pages’ section on WordPress i cannot find any of these pages using the URLs /video and /music.

So i try looking at (website).com/video and same for music and these ghost pages appear, but there is no option to ‘edit page’ like there is with my active pages on the website. So I can’t find a way to either delete the page OR change the URL slug within to something else so i’m able to free up the /videos and /music slugs for my actual pages.

Any ideas?