If you don't get the drop you expect -- did the installer loosen the inner bushings on both upper and lower control arms, and then torque them with the weight of the car on the wheels?
Lots of folks miss that step, but a pro shouldn't. This is also why some people will tell you that the suspension needs to settle -- popy cock.
If that isn't done the bushings are tightened at the original ride height and depend on the flex of the rubber to meet the reduced height. They will eventually come around closer to the reduced height, but they will be in a strain when they do. Premature failure of the bushings is the long-term result.
Maybe there is something else going on, but it is one thing to ask about. Or if you are real handy, and have a way of accessing the underneath of the car with the weight on the wheels, do it yourself. I know that last one is a killer for most folks, but it is why alignment racks are designed the way they are.