Wrong face thumbnail

[dsm1212]

So this is odd, but two of my faces have a bad "thumbnail". The list of images seems correct, but the thumbnail itself is now off. One is not even on a face, the other is on about half on a wrong face. It's like the coordinates of the face for the thumbnail got corrupted. When I click on it the pictures shown seem to be correct for the name I assigned to the face. Is there any way to correct this?