I have the same issue with our 2006 Driver side tail light. When you push the bulb in it lights. When you let it go, it goes out. I tried some dielectric grease in the socket and that seemed to help but it is not a permanent fix.
Sounds like you need to get a replacement socket... Moisture is a common problem in car's lighting sockets and if the socket gets too corroded you can't repair them..you then need to replace the socket...
KIA parts department should have replacements or visit a local salvage yard...
Pull the bulb out and you will see a small copper contact on the bottom of the socket. Use something small like a dental pick or tweezers and pry the strip up a bit. It will not take much so be careful. I have had to do this on both my rear tail light sockets.
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