Healing Hands's Unbroken Prayer has no channel cost (mana)

As the title says, it has no channel cost when being channeled.
If I invest in both Unbroken Prayer and Skyfall, it should have channel cost of 15 mana/s. But instead it cost only 4 mana/s. Mana cost of using Healing Hands is just 11, which equals to 15 - 4.
Is this a coincidence?
BTW, I did not invest in any -X mana cost nodes of Healing Hands.

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