Radeon6950

I've recently begun to build my Atari 2600 collection with a light sixer, and I've collected a couple games that required the paddle controllers. As I looked to find some, I found someone selling a 4 switch darth vader console, some games, and paddle controllers. I bought it, and used the 4 switch to play using the paddle controllers (which I had to clean) and it worked great. Later on, I tried with my 6 switch system, and it doesn't even register any movement, jittery or not, from the paddle controllers. Considering the contollers worked fine on my 4 switch, I'm assuming it's my 6 switch console controller port that's the problem. Has anyone else had this issue? Are there any solutions?