Hi Orangepop
I have come across this before myself. They are called ghost files. What has happened is your system is seeing more than one file the same. To fix the problem I have 3 ways:
1.I have left the room I am in and entered again.
2.Or I have needed to restart the computer.
3.Unshared files and shared them again.
Try those 3 and let us know how it goes.