Megamenu not working in responsive

We have just integrated JUXmegamenu in our site. It's working fine in big screen but in responsive drop-down is not working.

Dear Customer,

Thank you so much for using our product in your business. Pls let me know what your website is and how I can access to the back-end of the website so that I can know what happens and find a way to fix it. To keep your info private, pls send info of your website to email address This email address is being protected from spambots. You need JavaScript enabled to view it..

Hopefully to hear from you soon.

Best regards,
HieuPT