Menu position with sticky navigation

This may be theme related but is there any way to keep the menu position from moving to the right when the user scrolls down (when the sticky nav is enable)? It falls off the page.

Screen shots:

https://app.box.com/s/dexjgejli99dadrcv3yb5orcm4nxnvlu
https://app.box.com/s/sdllbsz41s28xdbaa1hcomtnq3g8zglw

Thanks!
Sharon

https://ww.wp.xz.cn/plugins/megamenu/