Dragging a song from a subgroup of the new group is copied not moved
The problem exists in the sub groups of the group "Archive\All songs\New". When dragging a song from a subgroup of the New group to another song group, the song is automatic copied, not moved as it is supposed to as default. In Music Archive there is no button to make a move by dragging, because the default dragging action always should be a move action if the song can be removed from the group. This means that a song cannot be moved from a subgroup of the New group to another group.
Songs dragged from the New group itself is moved as supposed to.

The only way to work around this bug is to move the songs from the New group itself, instead of moving them from the subgroups.