Why is this little icon showing, it wont go away ?

[nothing_666]

Halp!

https://app.box.com/s/njhdk3hxnvemotb4i7nwnk5shxu7weho

Picture because would be impossible to explain.

[frankz]

 These files were edited outside of musicbee and the library information does not match the information in the files' tags.

Right click -> Send to -> File Rescan.