Deffo doesn't do that in DD mate and didn't do it in Ruby. Thats a wiring fault somewhere for sure. Not even sure they're on the same circuit in the fusebox?
Really surprised the skirts are short, that doesnt seem right either as I'm sure they fit right up to the end of the sill on the mgzs. Know the aerodeck is longer from the rear door back but always thought they were the same size as the hatchback from the front to the rear arch.