Vincent Surmont

I just got a convertible top put in a 2005 mustang. The outside cancace of the roof is not attached on the sides or the bottom. We had a very heavy rain and the inside of the car I wet in the back where the top would be if down and it ran all down under the seats to the floor. It the outside canvas supposed to be attached to the window? Is there a plug I need to put in or a drain hole that might be blocked?