My guess is that you have operated the wipers when frozen to the screen the motor has turned leaving the wipers behind - hence wiper out of sync .
The wiper arm is normally fixed to a splined spindle and is held in place with a spring clip or nut.(coverd found maybe under the lower wiper arm)
You should be able to remove & reposition the arm/blade back to the correct position.
First ensure the motor is in the park postion even if the blades are in the wrong position. Reposition and secure.
Maurice
December 2010