1st Class Requirements checked off--but why?

I recently discovered that each and every First Class rank requirement for two of our 30 scouts, both of them currently Tenderfoot with some 2nd Class requirements done, had been marked as completed on 5-11-09. I deleted the entries, and they did not reappear.  These are the only two that I have (so far) discovered with this glitch, but I am concerned that it happened, and wonder why?  We've had no other problems with TM.  Can anyone suggest an explanation?