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This seems like a close hit. Water gets into the trunk and seeps onto the back seats, related to Forte GT2's post. Appears to be taillight is the culprit.
Kia Forte Questions - Water leaking? - CarGurus

From Forte GT2's link:
I had my local KIA dealer look at it and they discovered the backside of the left tail lamp assembly (the one fitted to the trunk lid, NOT the car body) had a hairline crack in it and was allowing water to enter & pool up in that tail lamp. When the trunk lid was lifted open, the water would then drain out of tail lamp assembly through the bulb socket, run down the trunk lid liner and exit through a small opening next to the left trunk lid arm, dripping water inside my trunk.
The dealer replaced my driver's side trunk mounted tail lamp assembly for FREE under warranty, which fixed my problem; no more water leakage.

Check the integrity of your tail lamp seal as well as look for cracks. Hoping it's something as simple as this.
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