Yea that's your problem. That's your tank overflow valve. So they looped it like morons. One is the breather, the other is the drain. Both need their own sections. It's an easy fix so don't worry about it, just correct it. When it gets hot out, they will have some pressure like you were describing. If done right, you won't have the gas cap drainage issue.
So i 3 nipple outlets on tank. I have the one on left and the 2 there that they have connected. The one on the left is consistantly dripping gas now. Would fixing these 2 connected stop the leaking on the other side?