mobile version error after the update

Hello,
I have passed an update for “Gantry framework” in my website. After the update, i found there is an error found in my navigation menu has overlapped the main “rt-container”. And there is no animation like the menu list “shrinks and extends”.

I have no way to modify the page and and their content sizes. And i finally i modified my “gantry.responsive.css” which is adapted the page size i need.

But the navigation menu for @media screen size between(min-width: 481px && max-width: 767px) still doesn’t work.

https://www.ads-software.com/plugins/gantry/