The science is perfectly sound.... the same things happens when you have older dental fillings and chew on a piece of aluminum foil
it is a very unpleasent sensation LOL
The fact that they have to cross an aluminum/galvanized (whatever it is)-copper junction on your table makes it very likely indeed
Just a side note, its potential voltage would be increased if the copper is insulated from the other metal... this would also help reduce galvanic corrision
well done Noddy, nice tek!