I just got a set of Koni str.t dampers and three of them when I push down the rod it rises back up, but the fourth rises about a half inch then it stops. I called Koni and they told me that it's either there is something causing friction or the gas isn't staying compressed, the later would mean they need to be replaced. Koni told me that to check if it is just friction I need to press it all the way down and twist it a little and if it rises more then it is just friction, when I do this it rises a little more but not all the way. I've also tried pushing the rod down and leaving it down and it doesn't ride even if I leave it over night. My question is do you think it is defective or not, also even if it is just friction won't one damper acting differently from the others be bad for performance?