Fix permalink

Hi

I am tidying up a site before launch. Once of the pages has -2 at the end of the permalink, however there is no other link on the site with the same name. When I try to amend it, it continues to revert to -2. Can someone please advise me on this – note I am not very comfortable working with databases, so want to avoid doing that? Thanks.

https://e4e.30f.myftpupload.com/innovation-2/