Side difference after lowering

After one day (about 100km) I measured my 500 with the Eibach ProKit (30/30) lower. That’s okay, but I’ve got 10mm difference between right and left. On the right it’s 40mm lower, on the left it’s almost 50mm lower. Is this going to work with the time and then it’s the same, or did they build shit? With the spring quality of Eibach, it seems strange to me, especially the difference between right and left. In the measurement, the car was unloaded and I also did the counter-test at different parking positions in order to exclude terrain influence.