Even if there are no defective receiver/pre-pro and wires, it is not unusual for the front speakers to have different outputs. The main reason is because of speaker/room interaction. You need to run a test.
Get brand new wires that are not defective and connect the left channel wire to the right speaker and the right channel wire to the left speaker. If the same side is still louder, it is a room problem. If the other side becomes louder, then it is your receiver.
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