Condo owners paying double to association on repair bills

Our association in Connecticut is charging us back for repairs being made to the common areas. In other words, we are paying our common charges, they are making repairs, and they are charging us back for the amount of those repairs. Is this not what common charges are for? Now, there are people-in the eyes of the board-who are being considered as being in default on their common charges, and they have begun foreclosure proceedings on these unit owners. Can they do this? It does not state anywhere in our bylaws that they can charge us back. Any help will be greatly appreciated.