Due to the varying leveles of red eye in a(n) image(s), the software may not recognize that a photo has red eye in it. Sometimes it takes a few clicks to completely remove the red eye. Keep clicking on the red area until all of the red is gone. If you have clicked several times and it still has not removed the red eye, it will not be able to be removed.
NOTE: The red eye in humans is different than that of animals. The software may or may not be able to correct red eye in animals.