Drop Down Mobile Menu not functioning

Hello there,

I’ve tried many workarounds i found online to fix this issue, but non of them seemed to have worked.

When i view this particular site from a mobile device, the drop down menu doesn’t open properly. It opens and then closes. Keeps on doing that everytime i click it.

Also on the desktop version, the hamburger menu icon doesn’t appear.

Do help me out with this if possible since this theme has really helped me.

The page I need help with: [log in to see the link]