Mobile Menu: Missing Event on some menupoints

Hey,

i using your plugin for my menu. I created my menu and setted all important settings for it. Also i setted it as mobile menu.

On this menu i have some problems. I have in my menu on level one three submenus. On level two are in one submenu two other submenus to more pages.

If i open the site on my mobile phone only the first submenu get open after click. The other submenus don’t get open. I already looked after the problem and saw, that only in the first menupoint, over which the first submenu get open, is an arrow. In the other menupoints with submenus, this arrows missing.

I marked the points on the picture. The blue circle shows the arrow, which are missing on the yellow points.

Here is a picture of the menu: https://ibb.co/2gtj6TR

How i can fix it?

Regards