Poison Storm & Infectios Cloud (Shaman)

[doden]

Poison Storm hits a single target with 3 waves of damage, but if there are more targets added, it will go down to 2 waves cast, and if even more targets are added, it will go down to 1 wave cast, and will not hit them all.

Infectious Cloud also hits a very limited number of mobs in an area, such as 3 out of 5 that are all clumped on eachother.

Is this intended? It seems that ALL mobs should be hit. And it seems that ALL mobs should be hit for ALL 3 times with Poison Storm (but it doesn't).