Nav Mobile Dropdown Not Working on Code Export

Works fine on webflow but not on my host.

Preview: https://preview.webflow.com/preview/slm-recycling?utm_medium=preview_link&utm_source=dashboard&utm_content=slm-recycling&preview=5bfa09c5d081b100a23474f7c9744f6e&mode=preview

external host: www.slmrecycling.com