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Are you both doing the same thing? I would have one rod with a jig and minnow or on a bobber and try and bring them in jigging then see if the neutral rod gets bit. If you both doing the same thing change it up and one use a rap and the other a spoon. I don't fish in a house much but do on a couple time a year when it gets real cold. I guess if one person's rod is moving the other is sitting still to see how the fish reacts.
you had the answer to your own question right in your hand. should have moved your shack to where you caught your five fish and seen what happened. while not guaranteed to happen every time or every place you fish. may have been pressure, maybe something structurally where you moved to that was holding more aggressive fish. small moves can make huge differences sometimes. I once had two holes about three foot apart in my shack caught fish in one hole nothing in other. I couldn't for the life of me figure out why.
We jig 2 in a shack all the time and also have 2 deadsticks down, normaly we both catch fish