if you can post a link to the "demo"-page, I'll have a look at the problem =)!
It doesnt seem to show up in Firefox, but does in IE9 and chrome and ipad as well.
mostly a js conflict, what happens when your not logged in?
Evolution user, I like the back-end speed and simplicity

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First of all it's not loading this css file:
http://www.leviosa.co.uk/cms/public_html/assets/templates/leviosa/layout.css I don't know if this file has anything you need but it's not loading.
Second looking at your code all you need to do is add display none to #ajaxmenu ul li ul specifically in line 36 in your
http://www.leviosa.co.uk/assets/templates/leviosa/modxmenu53-3.css file, that will solve your issue with the child uls displaying on load.
Good Luck.
@benmarte
oh Thankyou : )
Susan & Bob thought it was a CSS issue too, but I couldnt find it.
Cheers