Why do the menu titles change with the renaming of pages?

Are you in Appearance > Menus? Is that what you mean by custom menu? Can you share the code you are using to make the menu display? I have this in my header: 

wp_nav_menu( array('menu' => 'topnav' ));

Where topnav is the name of my custom menu. You have to add the pages to the custom menu in the “Custom Links” area, if you just use the “Pages” and checkboxes, then it will default to the Page title.

Hope this helps!

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