I have a partial fix for you!
The menu is opening and closing, it’s just not showing the elements due to opacity issues.
In the Menu Close animation you have set:
So add a 100% Opacity to both those elements in Menu Open and you should see the menu open and close again.
As I say - partial fix, once you’ve got that working, it looks like you need to check settings for the nav items which on second open appear abruptly rather than sliding/opacity. They likely need a ‘closing’ opacity added, something to return their animated state…
I’m happy to look further if you get stuck