Question about Kia Cee ́d driver’s seat

Hello everyone! Yesterday had a test drive in the Cee ́d CW 1,6 CRDI 115PS Spirit. 6-speed, test car had about 7500km on it. Quite neat. Diesel is strong, but doesn ́t like touring under 1500U/min, then it buzzes and vibrates something. But is not a prob. simply a gear back and is good. Very good equipment, quite good light, proper workmanship, tight suspension (but not unpleasant). But… what’s going on with the driver’s seat, I thought to myself at first. At first I thought: Oh, but there the driver in front of me tightened the lumbar support. But look, that was almost all behind. So what’s that pushing me so into the lower back? How am I to describe ….is like this little pressure plate which was inserted in the lower part of the seatrest again of course “I ́ve got pushed hard against it again with the back again, then what is this “pressure plate” back to the rear and at the same time the headrest is not something to support me at the front.