Mobile menu does not expand

Hello,
I have successfully installed JUX Megamenu on a customer's website and everything was fine until a few days ago when we realised that the menu does not expands on mobile clients. On Desktop clients the menu functions correctly. Could you help me to find a solution on this problem? The website's address is geosysco.com.cy .
Thank you.

Hi Alphabit.
Thank you for using our product.
Please give me link your site and your account of administrator via mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
I will check it for you soon