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Menu on mobile view not functioning correctly

I am having a very strange issue occurring with my navbar on mobile. It will not stay open when the hamburger menu is pressed? Is this an issue with the animation or with the ease timing?
https://preview.webflow.com/preview/nexient?utm_medium=preview_link&utm_source=designer&utm_content=nexient&preview=ae4017a691d693417a018ae18546863f&mode=preview

Here is my public share link: LINK
(how to access public share link)

https://preview.webflow.com/preview/nexient?utm_medium=preview_link&utm_source=designer&utm_content=nexient&preview=ae4017a691d693417a018ae18546863f&mode=preview