Hi Sam,

You may have a 'reversed' connection in either the headset cable or the headset itself.

If you have an Ohmmeter you can test this out. Test from the 'tip' of the cable plug at one end to the 'tip' of the cable plug at the other. There should be continuity. By convention the 'tip' is the left speaker.

The next connection on the plug down from the tip is known as the 'ring' and it is used for the right speaker.

If you get a connection from the tip at one end to the ring at the other your cable is reversed.

If your cable tests OK it may be that the wires in the headset itself are reversed.

Either way I suggest that you contact the manufacturer as obviously it is a production fault, as I assume that the headset cannot be worn or altered to suit.

The image shows typical connections. Usually it is only the microphone connection that may vary, unless the manufacturer wishes to have a 'proprietary' connection setup which forces you to purchase their product, (until you work out the connections yourself , of course).