trouble with page names

I have a strange issue with page names when creating pages

I created a page in wordpress

page-mk-learning.php – works fine

I created a page called
page-mk-mission.php – does not work – goes to index.php

I’m not sure why this is happening

the pages are identical in structure

they have different parents
learning/
team/

is it possible that team is a reserved name?

not sure what else to troubleshoot

here are the page links

thank you