third level sub menu items not appearing

On the site: http://www.digiss.com/

The mobile menu third level items appear to the far right… and then appears correctly after you click another nav item. If I check that all of the sub nav items fully expand they all show up correctly. Only in the collapsed version do they not appear correctly.

Have screen shots if that is helpful or go to the mobile site.

https://wordpress.org/plugins/slicknav-mobile-menu/