Hi, no it's not normal, those lights have permannent live and get earth to come on so there must be corrosion or something in the cluster which "leaks" to earth
Thanks for the reply buddy. It helps me make sense of it. A previous owner has wired an led light in place of the original... I'm guessing his wiring has go a little short. I had to replace some of his wiring to the rear lights, and it was...shocking!