Hero section flashes when I open navigation!

Design help Animations & Interactions
1

Hi, when i click on the hamburger, no matter where I am on the homepage, the hero section flashes up before the nav opens… why is this? Something to do positioning? Doesn’t happen in the designer preview, but only in hosted site on browser and mobile.

https://preview.webflow.com/preview/maybridge-security?utm_medium=preview_link&utm_source=designer&utm_content=maybridge-security&preview=3c379c22c75a1399b4b82b1d5fd5bc97&workflow=preview

Any ideas?? Thanks in advance

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