Yeah, it is normal. But easily solved.
If you have the stock steel bars the heat dissipation is minimal. If you have aluminum bars, the heat dissipation is terrible!
The reason the Dual Star kit I sold you has a throttle and clutch side is that most other brands of those style kits have two of the same elements, and you wire a resistor in line to keep the throttle side and clutch side heat output equal. The Dual Star kit does not require a resistor as the elements have been designed to accomodate the fact that the thinner grip on the throttle side means more heat will seep through than the thicker grip on the clutch side. Thus the clutch side element actually gets a bit hotter than the throtlle side element.
Anyway, the way to solve the heat dissipation issue is to wrap several twists of electric tape very tightly around the clutch side handlebar and put the element on top of that, or otherwise insulate the bar. I use heat shrink tubing, the 1.00" dimater stuff shrinks nicely around a 7/8" bar. It is not necessary to insulate the throttle side since the plastic throttle tube serves as an insulator already. Once the left side of the bar is insulated you will have equal heat output on both sides.