Custom Links in Avada Menu

When I set up a custom link in a menu to a section in an external page, somehow a “_” is added after th “#”.

In the custom link URL, I have
https://www.tourismus-brilon-olsberg.de/aktiv-sein/weitere-aktivangebote#bogenschiessen

When I access the link from the menu item, it translates to
https://www.tourismus-brilon-olsberg.de/aktiv-sein/weitere-aktivangebote#_bogenschiessen

Any ideas?
Thanks up front for any help you may offer