Hey Punisher,
this is indeed a theme bug, my apologies and thank you for pointing it out!
To fix it, you’ll need to add this code to the “style.css” file (opens by default when you go to “Appearance -> Editor”:
.widget_nav_menu ul ul, .widget_nav_menu ul ul ul { display: none; }
and hit “Update File” to save the changes.
Let me know if this removes the problem!
Best,
Andrew / Satori Studio