I am a bit confused (Auras/mana question)

Greetings All,

I am running a Templar lvl 25, (smite build), I have a total of 463 mana, using 351 on Heralds of Purity and Ash, and have 112 free. In the field, both Heralds are dark and when moused over state that there is not enough mana despite the 112 free and I can still use both normally despite this.

I am using some mana reservation for the auras, but I am confused why it states not enough mana, but can still use them. What don't I know/can't see?

Thank you all for any help!

Starrfyer

Can't see your character to help... But maybe you have another aura on and forgot about it?

OR are they linked to a support accidentally