Issue duplicate PAGES/POSTs for SEO

hi All,
I’ll getting this issue on all my WP sites. Please see some example on site
/about/page/30000/
/page/10000
replace the number 30000/10000 with any number and its the same. these pages are not exist in admin
I think this error is from WP. Anyone can support/assit me this?
Thanks so much!