Well mine is a 1990 right hand drive and the wipers go from left to right.
I suppose if it was a left hand drive then the wipers would go from right to left. Perhaps the first batch of right hand drive conversions would retain the left hand drive configuration though until they had got their act together and did it properly?
I think that it is quite common for them to do that and not just with VW's either and it's not limited to wipers Eg hand brakes, clocks etc. I could be wrong though