Mobile Menu Not Displaying Properly

I need help, the mobile menu isn’t showing up properly when used. It used to be clean, visible, and scrollable on the right side of the screen and for some unknown reason, it now shows up small, unscrollable, and incomplete on the left side of the screen. What can I do to resolve this matter? Please note that I have made no changes to my site in weeks yet this happened. I do not know code BTW. Thank you in advance!

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