Ok that’s odd…
I added a child button (another page) under my “ZF” one, and i don’t have this bug, everying is working fine.
@selarsen : You don’t need to add submenus. You need to create a new menu in “Appearance”, then choose this new menu for the Lightword Navigation Bar, add the pages (those you had before the update) to this menu, and then save the menu.
I made a screenshot here.
Hope it will work.
@kelvin15 : Once you created the menu, you can add the pages on it.
@jobprompt : I think you should have made customizations on a copy of the theme, to have a backup when you update it :-/
@aaroneight : Thanks a lot ! It works like a charm 🙂