Hamburger not opening menu on mobile

The hamburger works and expands the menu on ipad and landscape mobile, but does nothing in portrait mobile mode. Please advise. Thank you in advance.


Here is my site Read-Only:

https://preview.webflow.com/preview/top-shelf-talent?utm_medium=preview_link&utm_source=designer&utm_content=top-shelf-talent&preview=3d916cb62f765b322ca592b7474963e7&pageId=6275a09fb7eb2c6b3b45948e&workflow=preview