It is hard to say definitively without some additional information. The vehicle looks lifted and appears to have some quality components on it. Things that come to mind are:
1) Is this your first Jeep? Although Jeeps can - and should - drive straight and reliably down the road, a lot of younger drivers have simply never driven a vehicle with a steering gear (vs a rack-and-pinion setup) and the difference can take some getting used to.
2) On a straight road with little to no road crown, will the Jeep drive perfectly straight, or does it pull consistently to one side?
3) Did the PO provide any service records, particularly an alignment print off? Steering "wander" is typically a result of incorrect caster, which is common on lift kits that do not use adjustable control arms, or ones that have not been adjusted properly.
4) Are the tires wearing evenly and in good condition? What is their current air pressure at?