Menu-Link doesn't work properly when moving a page

Hi! This Plugin works great for me, with one litte problem: when I move a child page to an other parent page the link is duplicated to the new parent page, but also still remains at the old parent page, so I have two links in the menu at the end. Is this a bug or an user error?!

Thanks in advance.

https://www.ads-software.com/plugins/auto-subpage-menu/