Hi, This template is done with bootstrap 3 and this is the difference between bootstrap 3 and older versions. bootstrap 3 doesn’t make collapse menu for 768px, it makes collapse for max 767px.
to resolve this problem try to increase for one px all @media (min-width: 768px) to @media (min-width: 769px) and @media (max-width: 767px) to @media (max-width: 768px) in bootstrap.css
but i’m not sure if you will need to change also somethink in bootstrap.js because collapsed menu should have some code lines also in script.
Hope it will help you
Regards Besim