Valenti tail light issue.. all the lights work but..
 

https://www.youtube.com/watch?v=hqy9...ature=youtu.be

Whenever the driver side turn signal is on, the running light and brake light turns off. I've tried plugging in the driver side tail light into the passenger side connector and same problem still exists, so I'm pretty sure it's the tail light's problem. Passenger side tail light works fine.

I have yet to find anyone with this problem so any help would be appreciated, thanks!

Since you have confirmed that is the taillight itself, you have two choices. Take it apart and try to repair it or replace it.