Sadly you can't trust the spell descriptions.
Target AoEs can hit 4 or 5 creatures (depending on the specific spell).
Point blank AoEs will hit everything in range (well, up to 25 creatures on this server).
Rains will hit up to 3 mobs per wave and do up to 3 waves. There is a maximum number of hits that a rain can generate too. I can't remember what that figure is though.
These are not bugs, they are working as they did on live at this time. The error is in the descriptions, not the mechanics.
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