Sorry, 

please add following code.

ul.menu ul li {

    float: none;

}

Best regards,

applying css it does work for mobile menu

Some styles in Adivaha plugin makes the website messy.

Please use following css.

ul.menu ul li,{

    float: none;

}
Best regards,

As I said before, it is because of Adivaha plugin. Please deactivate it and try again.

Best regards,

Menu item not working proper in mobile and tab

Hello,

I checked your website.

Please use following css in theme options panel to fix it. Menu item is messy because of Adivaha plugin.

#main-menu ul.menu ul li, .chaser ul.menu ul li {
float: none;
}

Best regards,

Menu items doesn't fall properly as shown in demo, please check my site and also attached is screenshot for the same