As roadrabbit says, the VORs are not necessarily aligned with mag north. The difference between true north and the VOR reference is called declination in the USA. As far as I know, the declination can be adjusted from time to time.
You will often find that two VORs at the opposite ends of an airway don’t line up; e.g. the airway starts off on the 060 radial from VOR ‘A’ but then arrives at VOR ‘B’ on the 242 radial (062 inbound), even though the airway is plotted as a straight line.
The reason can be due to different variation at the two VORs but over a relatively short distance is more likely to be due to a difference in the two declination values.