Hello Support,

I have to transfer a website from old database to new one and update Joomla and template helix ultimate. So I restored a backup to a subdomain and brought back most of features functioning. Only burger menu I don't find the error: When site is so small, that burger menu is displayed and I click on it, it seems to put a layer over the page but no menu is visible. The site is http://ffs-u.fotofreunde-seligenstadt.de/ , can you help please.