Music insists that it has already been downloaded
 

When i attempt to download certain songs or audiobooks they will have a green tick by them saying they have been downloaded although they have not.

When i download it it tells me that the exact same file is already in my music folder in this case it says that a song by the von bondies is the same as the new file i am trying to download.

I have deleted that song but it still comes up with that message.

Although i can still download the file i then find that i cannot add it to my music libary.

It does not say anything it simply will not be added to it. Please help!