The cover could be installed wrong but I've never seen one warp. You may want to remove the top cover and look at how the belt is tracking in the center of the sprockets and whether it's shredding on the sides. If it's not perfectly centered you can expect there's something wrong with the sprocket alignment or tensioning device.
Since you didn't list the engine size I don't know if it's an interference engine. If its is and the belt breaks, the open valves will be hit by the pistons as they coast to a stop. That repair will cost more than the car is worth.
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Monday, May 6th, 2013 AT 1:57 PM