Hamburger not opening menu on mobile

Design help General
1

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