I had the same thing happen with the Hot grips I had on my 04. Here's what their web site says.....
Sticky, gummy grips that wear quickly and leave black residue on your gloves and hands. By riding with leather gloves that have been treated with a leather preservative, the grips are constantly getting that preservative pressed and rubbed into them under high temperature, changing the chemical makeup of the grip.
The MINK-OIL treatment of your leather glove palms can ruin the grips. One fellow from California admitted using a hair dryer to melt the mink oil paste into his leather gloves to treat them. That would be MANY times worse than getting an external petroleum based spray on the grips (which we discuss below), because whenever you ride with those treated glove palms the grips are being exposed to hour upon hour of a modifier-substance that is being pressed and twisted with elevated temperature into the grip outer surface...causing the oil migration into the grip. Oils are used as a polymer-modifier in the raw material stage of producing the polymer pellets, long before we get the resin pellets and injection mold the grips.
The "rheology of the grip surface" has changed permanently and NO treatment can reverse the process. When you attempt to solve the problem by exposing the grips to yet more petroleum based treatments, you just make it worse. You might sprinkle baby talc powder on them (and your glove palms) to reduce the tackiness but I don't know how long that would be effective before additional application is needed. Replacement of the grips will not solve the problem, since it is exposure to the MINK-OIL in the leather glove palms that is the cause. The only way to prevent it would be to cover the grips
when new with anything that is either a natural rubber, a PVC (vinyl), or some other polymer that is not attacked by leather preservative. If you pre-wrap the new grips in tennis racket rubber wrap, and the tape wears out, that is cheap to replace.
I say BS, I never used mink oil on my gloves. I'm hoping my Oxford heated grips on 2 bikes doesn't do this.