Normally, joist run one direction, then the sub-floor runs 90 degrees to the joists, then the hardwood runs 90 degrees to the sub-floor. So you see, everything is normally 90 degrees to the layer above/below.
I've seen installations where 2 layers would run the same direction but usually, the bottom of the 2 layers is something like 3/4" plywood or 3/4" subfloor. You could get away with the not-so-normal installation as long as you have solid under-layers. Check it out. Other than aestetics, I don't see a structural problem as long as the 'normal' situation is in effect or the not-so-normal one has strong/thick layers. Just as an aside, if the joists, subfloor, AND hardwood ran the same way, I'd be a little concerned. Hopefully, your hardwood floor is 3/4".