Hi,

Example:

You have two folders in bookmarks: Folder 1 and Folder 2.
If you add a link in the Folder 1 it is accepted - that's cool.
Try to add the same link again in the Folder 1 - the error will pop out "This link has already been bookmarked in the selected folder."

Now try to add the same link in Folder 2 - it is accepted - not cool.
If you place the same link in Folder 1 and in Folder 2, and delete the link from Folder 2 it is also deleted from Folder 1.

Also, if you edit Folder 1 and move link into Folder 2 - you will have two identical links in the same folder.
If you delete just one link from Folder 2 - both are deleted.

I am confused with this logic

I have put up an update to fix this issue.

Adrian