Yes it looks like you have a broken spring or maybe the frame has broken.My 300D's driver seat is low on the outside and twists my back, it seems to have a broken spring,but the whole seat doesn't sit that way just the bottom.On my Mustang the seat frame was broken, I stripped the upholstery off and had a friend weld it back together.
1985 380SE- 160,000km 'Blistu' - Sold
1988 300CE- Eva,my garage mistress
2007 R350 4matic- The Black Pearl
2011 Ford Ranger-Work truck
1974 25' Trojan Sea Raider- 'Grannyknot'
2002 215 cm Atomic DH skis- Canadian SDH record holder, 175.5km/h- Vars 2010