Is it a bug? or is it just me?

When you get a Constant energy spells such as Mending (example) on the "Heros" it won't take effect. Even when the Heros use it in battle, it won't work "sometimes". This gets very annoying becuase I need my henchmen to carry this spell. Any Help?
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I have this build but I can't use it on my Hero's.
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Healer's Covenant - Elite Enchantment Spell. While you maintain this Enchantment, your healing Spells heal for 25% less Health, but cost -1...3 Energy.

Healing Whisper - Spell. Target other ally is healed for 40...88 Health. This spell has half the normal range.

Orison of Healing - Spell. Heal target ally for 20...60 points.

Healing Touch - Spell. Heal target touched ally for 16...51 health. Health gain from Divine Favor is doubled for this spell.

Healing Breeze - For 10 seconds, target ally gains +3...8...9 Health regeneration.

Words of Comfort - Target ally is healed for 15...51...63 Health and and additional 15...39...47 Health if that ally is suffering from a Condition.

Mend Ailment - Remove one Condition (Poison, Disease, Blindness, Dazed, Bleeding, Crippled, or Deep Wound) from target ally. That ally is healed for 5...57...74 points for each remaining Condition.

Heal Other - Heal target other ally for 35...150...190 points.

Any Resserection
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Put points in all healing and divine favor. This build is most helpful with a necro with blood rit.

It's because the heroes will cancel maintained enchantments. What you have to do is disable Healer's Convenant and manually use the skill for your hero. As long as the enchantment doesnt get removed, it should stay put. Just click on the skill again even if it does get removed.