Oxygen Theme Showing Navmenu Twice

I am using the oxygen theme on this WordPress site. The theme is working fine on the homepage, but not on the side pages. It shows the navmenu twice on the inside pages and I’m not sure why. I had to create a new template which I called “Inside Page,” which was identical to page.php, and that took care of it. But, I don’t understand why.

I have left one inside page, Contact Us, using the default theme so you could see what’s going on. Below it is the link to the About Us page which is an example using the new Inside Page template I created.

Contact Us: https://ilsa.startlogic.com/dragonbutterfly/contact-us/

About Us: https://ilsa.startlogic.com/dragonbutterfly/about-us/

The fix I’ve done is OK, except that I want my client to be able to use the Default page template for creating new pages if need be.

Thanks.