Mine did this with VW Racing springs and B8 dampers. After having the B8's fitted it raised the car back to where it was when I originally had the springs fitted - over time my OEM dampers had become old and the car ride height dropped from a sensible 20mm drop to something like 50mm - so much the car looked like it was slammed on coils rather than just the most minimal lowering springs I could find.
How many miles were on your dampers when you changed them out? Could it just be your old dampers were sagging a bit like mine were?
Mine were on just over 70k and had lost most damping effect - the car felt like there was no compression left in the dampers.
This is how mine sat the day after the B8's were fitted to the VWR springs;