May I know in which format have you captured the images, as Canon can shoot both in Raw and Jpeg.
Please check your Camera Card you might have two different format (Raw and jpeg) for the same image.
My camera is set to shoot RAW. Thanks!
Would you please copy couple of images from your camera card to your desktop and then try to import them in Lightroom and check its format.
Sarika ~ I'll have to do this when I get home. Thanks!!