Menu Heading - missing arrows icons

I just saw that I have one bug in the menu, when I changed the type of some Menu items (categories that contain subitems) to "Menu Heading". I successfully managed some styles, but one thing left. The arrows for drop-down disappeared. The reason is because these items are no more links, but span.titreck is already contained in the new span.nav-header. How can I change it? Probably I have to do the changes in helper.php? Does it have something to do with span.separator?

Please give me some directions.

Hi
Please give me your url and tell me on which item it occurs
CEd

85.91.136.128/joomla/

The second and the third and two more horizontal menu items should have arrow icon.

And it's the same with the submenu item - the first subitem from the second main menu item should also have arrow.

try to change the type "heading" into "text separator"

Thank you very much! Now it's all working wonderfully. I just have to do some styling again later.