Permalink issue, maybe a bug, maybe user error

Hello
I’m experiencing some weird issue - I have a page with the slug ‘about’ when I like to open that page like ‘http://localhost/cms/about’ it opens the blog/archive page - any other link like ’ ‘http://localhost/cms/chatgpt’, etc. does the same - all other pages with a slug other than ‘about’ open the correct page - I’ve reset permalink structure several times and tried a few other things with no success.

hope somebody has any idea