Hello,
So the situation is that after clicking one of the menu item, you are redirected to the target - actual page (node), therefore the node in the menu is not highlighted...
This is not very good scenario for our menu/navigation webparts... however you could modify the menu webpart (clone it) and in the code, set e.g. the property
Highlighted document path dynamically (see
Setting webpart properties dynamically in code) using some code that would match the current page name (or any other flag) with the node that is picked by the menu (the one with redirection).
Regards,
Zdenek