вот что то похожее
http://us.battle.net/wow/en/forum/topic/1921697100
I noticed the final heal on lifebloom is treated as a separate heal when mastery is applied. In other words that final heal only benefits from mastery if there is still another hot on the target, regardless of if the lifebloom hot was benefiting from mastery.
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попробуй повесить еще одну доту