When you fitted new dampers, did you do the work yourself or did a garage do it?
I would check that;
a) The spring is located properly in the spring pan (i.e. the end of the spring has to be up against the step in the spring pan.
b) The bottom spring (rubber pad) cushion is fitted and in good condition (no holes in it - otherwise the spring can be touching the pan)
c1) If you have spring catchers, are they loose?
c2) Did you fit the drop-link to the main spring pan bolt? A few spring catchcers seem to be labelled L/DX and R/SN but if you fit them as labelled, the drop-links attach at the main bolt hole (behind the damper). If you reverse the spring catchers, the main bolt is at the front and the drop-link connects to the damper at the now empty bracket at the rear. Fiat's diagrams for the spring catcher shows that the drop-link does not connect to the main bolt hole.. but this is inconsistent with the labels on the spring catchers.
d) Are your drop-links okay (and not loose)?
e) Jack the car up (the whole front end at once) and look at the springs. If one of them is bowed out and touching the inner wing, then the spring is snapped (maybe just the last 5-8cm at the bottom. You'll need new springs.
Ralf S.