That would be Sasha and Malia Obama in that photo. (Click to enlarge)
And no, it's not a coincidence or web glitch.
Click on the photo at that page and you go here, for a larger version with this caption:
ASSOCIATED PRESS PHOTOGRAPHS The Obama daughters (above) - Sasha, 7, and Malia, 10 - attended the private University of Chicago Laboratory Schools. This school year 36 of the city's school children have been killed.