Unlikely, but if your PJ's look to be in reasonable condition, they might have been sprayed with a sprouting inhibitor.
If so, the inhibitor could well be inside rather than on the surface of the tubers, but it might be worth giving them a good soak in water in the hope of reducing the effect.
I'm assuming the KE's chits are long and white if they've been kept in the dark - they all need to be in a reasonably light, frost-free place at this time of year.