the mega menu responsive is not working on my website

here is the link:https://www.extendoffice.com/support/about-us.html

i have publish the mega menu with responsive enabled. But when it displaying in tablet mode, when i clicking on the menu it does not show up anything.

How long does it going to take?

Hi Lin,
I'm sorry.
Please give me some time. I will contact you via mail or this topic.
Thank you so much for empathy.