Casting Spell Twice :(

[RonSwanson 2]

For some reason this spell keeps interrupting its self 3x and then it finally casts, but then it casts 2 times in a row. But yeah the bot keeps interrutting itself with another immolate 3 times in a row and then it casts 2 immolates in a row. 

 

            if (!ObjectManager.Me.CastingSpell.Equals(IMMOLATE) && !ObjectManager.Me.TargetObject.HaveBuff("Immolate") && IMMOLATE.IsSpellUsable
     && IMMOLATE.KnownSpell)
            {

                IMMOLATE.Launch();
            }

Any ideas  on how ton fix this?