wordpress issue with permalinks and page hierarchy

Hello,
I’ve got WP 4.9.9 web page on Nginx server.
The are permalinks setup and i have page hierarchy (parent page) something like this:
mydomain:
– services
– service one
– service two
-…

When I type in browser mydomain/service/service-one everything works OK.
The problem is that WP allow to type every possible prefix in url (non-existing parent page slug) and it will serve the proper page as long as correct slug is in the end.
So when I type mydomain/whatever/service-one I still get service-one page, I can even type many parent pages like mydomain/whatever/some-random-txt/service-one and still get the service-one page.
Anybody knows why?