On a RH guitar, you increase volume or open the tone by turning clockwise. So strictly speaking, on a mirrored lefty, you want the reverse, i.e open up by turning anti-clockwise. Most manufacturers now fit reversed pots, but back in the 70s Fender didn't.
To be honest, the only time it really makes a difference in terms of playing technique is "violining" the volume with your little finger on a Stratocaster or similar, but I agree it is confusing and I think I'd do the same.