Rear light cluster issue

[sinto607276]

I would agree the green wire has to connect to the other green wire/brown wire combo (I'd personally strip all wires back, solder and heatshrink them as the pic shows bad workings) and I'd check all other wires :b

I think your mixing up the idea that all your lights came on at the rear when you pressed any of your brakes.
The bulbs in the rear lights are dual element stop/tail lights and when you press your brakes when your lights aren't on you'll get the same effect as you got due to this. Also as it has a clear plate on the underside it lights up your number plate thus giving you the idea all your lights work when you pressed the brakes, try it without putting your lights on and you'll get the same result