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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.
hmm that's strange, normally you can daisy chain elements in the way you want at the front.
in the first diagnostic, does it list the culprit shifter properly ?
In any case you might want to wait for a full charge, as it doesn't charge when e-tube is running