Ramanath Parimi

Great observation!

The shattered mirror (how many parts it may be), when joined back, it has to be joined perfectly flat and all the pieces should stay  or align flat (or at the same orientation) . If that happened with your case, you would've seen a single image of yourself.

But, if there is difference in the angle between the two broken pieces when aligned, each single piece acts as a separate mirror and shows a different reflection. The reason for this is the light reflects from the mirror back at an angle which it hit the mirror surface. The difference between angles causes different reflections and hence different images.