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i forget the scientific term, but the parking brakes are designed to ratchet wider as the wheels are turned. the result is that if the car is moved, the brakes are applied harder.
what's probably happening to you is that you're pulling the e-brake lever while the car is still rolling back. this causes the brakes to be applied harder than you actually pulled the lever for (you may pull the lever for four "clicks", but get seven "clicks" worth of braking force). this creates slack in the e-brake cable. when you let the brake off, the shoes are still spread. as you pull forward, they release and take out the cable slack. this is not a problem. if you don't want it to happen, make sure the car is totally still before you apply the parking brake.
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