I have noticed that the passenger seat in my liberty sort of has a lump in the butt area after someone has been sitting in it for a while.. It is quite noticeable. It is best described as a big air pocket between the leather and the foam. I have never seen leather in a car do this before. My truck has 23000kms on it.. Would new seats be covered by the warranty? I can only imagine it getting worse.

You should have a factory bumper to bumper 3 year 36,000 mile warranty to cover that

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2008 KK Liberty Sport NIGHT OPS EDITION + GILLS
OEM & Custom Skids - Factory Tow Package - Rock Lizard Skink Super Sliders
Prototype JBA 4 Inch Lift - JBA UCA's - Flowmaster Super 44 OR - Whacked Resonator
Jet Stage 2 - RL Gecko Basket Rack - Custom Winch Bumper - Recon 10.5K Winch

I've noticed the same thing happening as well, even in my driver side. Although it typically goes away every time I notice it. If mine gets any worse I may get the stealership to check it out (only at 15k miles so I have some time)

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2012 Jeep Liberty Grey Jet Edition
OME 3" Lift (HD/MD), GY Silent Armor 245/70/16, RRO Adventure Rack, Steelcraft Grille Guard, WeatherTech Mats, Cobra CB w/ 3’ Whip, 12” LED bars, mud

Never Stop Exploring

I almost wonder if it could be the leather stretching and when the weight is removed it goes back to original form but then the leather still has slack in it. Then leather forms back to the seat? I don't know...just an idea.

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2012 Jeep Liberty "Arctic" Edition. 2.5" OME lift, 1/4" clevis spacers, 245/75R16 GY Wrangler Duratracs, AtTheHelms steel front bumper, semi gloss black emblems and fuel door, 15% tint all around.