How do you delete "phantom" audiobooks from itunes
I have downloaded audiobooks from my itunes library to my iphone 6 plus. When I'm done, I delete from the iphone. Sometimes, the audiobook still shows up in my itunes when I'm showing the list "On my device", even after syncing. There seems to be no way to delete these books -- they are not showing in my iphone (and I have also checked iphone storage) and there is no delete from itunes. I also can't click the delete button on the keyboard when in itunes to delete these audiobooks. Any ideas?
iPhone 5, iOS 8.1