My menu won't open in tablet or mobile

For some reason my menu won’t open in tablet or mobile. Basically, once it switches to hamburger it doesn’t work. It will open if I select to open it over right or over left, but not for drop down. And even when I do select over right or over left, the formatting is awful and it takes up the entire screen so that you can’t get out of the menu once you open it.

I just want a functional dropdown menu and don’t understand why it’s not working. Can someone please help?

Here is my site Read-Only: