The number is added to distinguish between the two pages that share the same name, since two pages with the same exact URL cannot exist.
For example: www.example.com/services-1. This is an indicator that the website has more than one page named services.
If you see a number other than 1, it means that there is more than one page that shares the same name ( for example, the number 2 indicates 2 additional pages and so on)
To resolve this, please go to your website editor and locate the relevant page in the pages list, then change its name.
Note:
The same applies to page thar are hidden from users, or from the website homepage.
