Maryland's pension system overpaid 45 retired employees from the Maryland School for the Deaf. They were given a total of $487,000 too much over a period of 22 years. The state will probably not ask for the money to back. But future retirees now know they won't be getting as much money as they thought they would. State officials blame miscommunication between the State Retirement Agency and the Central Payroll Bureau which wrongly classified 10-month non-faculty employees of the school as working for 12-months out of the year.