Rhythmbox sync to library deleted all my music files

I use an external usb drive to store my music, I added the music folder on my external usb as the library in preferences. Now when I did this it did not look like it was adding anything to the library so I clicked import folder and imported the music folder from the external usb drive. This imported all my files however they did not show up in library under music, showed all my files under devices which is not what I wanted as it was having to rescan the library every time I started the program. Then I clicked the sync to library button which deleted all my files without so much as asking me. Question is, is this a bug or should it be marked as an improvement to rhythmbox?