well, the problem is, the schools obviously didnt move, but the gear inside them may have moved, i.e. being sold to another school district.
Drive by it and log it and then upload the points. Give it a day to update on the maps, and then look again, or try digle. I'd wager to say that they've just upgraded, and the previous points have moved because they have been scanned by someone else in a different area.
The possiblilty also exists that someone representing the school has asked for the points to be removed. My company has a no wardriving on site policy so it wouldnt surprise me if they have asked for their AP's to be removed. They even requested that google blur the site on GE and totally remove it from streetview.