All spells you current have on are wiped on the server when you zone, the client isn't getting told this so it still thinks you have the buffs sometimes and displays what it thinks your max hp is
IIRC Willowisps should hit for up to 26, they aren't newbie mobs you know
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++[>++++++<-]>[<++++++>-]<.>++++[>+++++<-]>[<
+++++>-]<+.+++++++..+++.>>+++++[<++++++>-]<+
+.<<+++++++++++++++.>.+++.------.--------.>+.
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