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Not had that before, unless some components are used/setup from previous install and maybe have some mad coding on them?
Recently been doing the charge port in one bar end and the bluetooth module in the other, and not using the Y cable. You have to shave down the little nubs on the bluetooth module but fits nice, range is around 3-4m which is fine by me, means you don't have to look at the bloody thing or try and o-ring it to a stem or seatstay etc.
That's what I thought. Apparently not.
Had to rewire it in a specific order and it now works. Left shifter to the jA with a Y wire also connected to jB, short wire jA to right shifter. Works now.