Menu not responsive

Hi Guys!
I have 3 websites with this theme(all with the header content centered) and i was upgrading the first one to the latest version.
Unfurtunally looks like the menu is no more responsive.
I was workin on a big screen and the menu continued to go on the left instead of stay in center (as it still look on a 13″ laptop).
Any way to fix it?

Thanks