Quick question 1st time setup Onkyo Audyssey

[Collectors Set]

I have 5 total speakers + sub. So it goes through and correctly identifies my fronts and center. But it only picks up a Surround Back Right and not the left. So obviously I swapped speakers and same thing, only picks up Surround Back Right. But by swapping I know that the problem is not with the speakers because both of them made the zapping noise nor is it my connections. It has to be the Surround Back Left terminal on the receiver?? Any suggestions appreciated