Error with sticky menu

Hello,

I’ve a bug with the sticky header on the mobile with Overlay pro. The sub-menu are riding over each other once the sticky header is activated. It works fine with the menu when you are on the begin of the page. (not scrolled out)

I’ve tried to change the theme to the default one and the problem still. I deactivated all plugins that could impact it but it doesnt change anything. The issue is the same on your site !

Could you help?

Thanks and regards,
David