My VP2 appears to have worn some grooves in the direction potentiometer around WSW (our most common direction) & the resulting dead spots report as N, hence the reason the Elgol direction is often bucking the trend. The same sort of thing happened about 2 years ago.
And as part of maintenance the mast is currently at half height, which puts it well into turbulence from the house for any sort of westerly, hence in the early January storm we had a 63mph before midnight, when there was still plenty of S in the direction, rather than something much higher from the WSW in the small hours (my guess is that the full height mast would have recorded at least high 80's, possibly into the 90's).