Caution Faulty circuit

After an audition with the intermediary distribution yielded a gruesome result, the left channel was much quieter and distorted, I measured by the adapter. The three contacts of the two jacks and the plug should be connected one to one. But it is not the mass of the plug is connected to the right channel at the sockets, the right channel to the left channel and the left channel to the ground. Thus, these are only to electronic waste.