When Playing Candy Slam, targets may not show their true value.
Play Candy Slam normally, but listen to the sounds each target makes. You will often hear the Toxic sound when hitting a Candy target.
Targets to correctly correspond to their value.
Often Candy Targets will subtract from your point total, preventing you from getting higher rewards.
In my experience, it was often the second of a double-hit. It was also only happening in the back rows from what I saw.