Just change your no link items’ HTML from this:
<span class="btn link">testseite</span>
to this:
<a href="#">testseite</a>
Or if you like, you could also add a class to the link – e.g.:
<a href="#" class="no-link">testseite</a>
and some CSS to use the default cursor (or even disable the hover, etc.):
.no-link {
cursor: default;
background-color: white !important;
}
In general, it’s not recommended having no-link items that have sub menus for various reasons. For a bit more insights as to why, you can take a look at the following topic:
https://www.smartmenus.org/forums/topic/how-to-make-this-work-with-no-links-at-the-top-level/