There is a big difference between the original or plain image height of a picture, photo or image, and the Cropped Image Height. If you want more information about the general height of an image, click here: Image Height
The original or general image height determines the actual size of an image. The Cropped Image Height does exactly the same, it states the actual height of the image. However, this value appears in images that do not have the original size anymore since they were cropped.
Cropping is the process of selecting a certain section of an image and cutting away the excess image. Thus, cropped images contain only part of the subject of the photograph. Naturally, this means that the Cropped Image Height is smaller than the original image height in most cases.