We were booked at the Poly for a standard room during free dining in mid-September. Received a call from Disney reservations yesterday. They offered an upgrade from the Poly to a lagoon view at the Grand Floridian. When we asked the reason for the upgrade, the cast member said that the Poly was completely double booked for the week we are traveling. Apparently the "magic band" service (as the cast member called it) had a glitch that opened all booked rooms at Poly for new reservations. They are now contacting everyone that was originally booked at the Poly and offering upgrades to the Grand Floridian. This affects most mid-September Poly reservations for free dining we were told.