There seems to be a problem with the Navigation for the Ascent template.

On the iPad if you scroll up and down on a long page a few times, the menu buttons simply disappear (see attached).

On the iPhone (which renders a toggle menu), scroll up and down on a long page and the toggle menu stop being able to be expanded.

This is reproducible on the live preview demo on the joomlabamboo site: bambootheme.com/showcase/oct12/

Anyone else see this problem?

Thanks