I had the same problem, but then removed the %%sitename%% from the post title template and the pages template and now it’s fine.
Worked for me. Thanks JaySilver21
This is controlled via menus ( refer codex: http://codex.wordpress.org/Appearance_Menus_Screen )
Just make sure “About” and “About Overview” are.linked.to the same page.
Hey jibbius, thank you view much for the help. I figured it out. I created a custom link under menu tab and made the about overview address the same as the About address. Thanks again for the help:)