It seems that adding a Button Dropdown element to a page solve the problem in that page.
I don’t know why is this happening, but i have solved the problem adding a display:none div in theme footer, and adding a do_shortcode like this:
<div style="display:none">
<?php echo do_shortcode('[qd_dropdown dropup="dropdown"]
[qd_dropdownhead style="btn-default" size="" split=""]
Dropdown
[/qd_dropdownhead]
[qd_dropdownbody]
[qd_dropdownitem type="menuitem" link="#" ]Dropdown Item[/qd_dropdownitem]
[/qd_dropdown]'); ?>
</div>
It’s possible that the shortcode add some javascript or so?