Not calling all posts

When I try to list posts by month, it doesn’t call all of posts.
It only gets number of posts I chose in “Setting > Display Setting > Max # of posts per page”.

This happens in wp-pagenavi, and other plugin I used to call posts.

I did research that this is about array, but I’m not expert, so I need help.

This is my website: https://innadeshikoway.com/

This is my month page: https://innadeshikoway.com/?m=201504
This is a page I created using a plugin to list posts by month: https://innadeshikoway.com/?page_id=622

For the bottom 2 links, it should show 23 posts, but only showing 10 because of “Display Setting” (I have it as 10).

Thank you for your help in advance!!