Thanks for the answer,
I really do not understand, tried the same as you, resized screen in firefox and chrome, on click nothing happens as well as pressing on mobile device.
Also, I noticed that there is nothing under
<div id="mmenu_holder" > and
<select id="mmenu" class="yjstyled">
while with default menu there is a whole mobile menu there as it should be
I cant explain how can you click it ?
Blocked css is not important here