I would expect the Kia dealer to investigate the cause of the uneven tyre wear. More often than not, it's linked to underinflated/overinflated tyre(s) or an issue with the wheel alignment. In more serious cases, it may indicate a problem with the suspension.
I'd start by checking the tyre pressures (the correct PSI rating will be in the owner's handbook and/or on a plate inside the driver's door).