Not gaining power charges

Good afternoon,

I do not know if this is a bug or a misunderstanding. I am a Heirophant, with the Conviction of Power node (4 min power/endurance charges). I am using a Forbidden Rite totem setup, with a total minimum of 5 power charges (4 from ascendency, 1 from Disciple of the Forbidden anointment), and a maximum of 6 power charges, due to my ascendancy and Void Battery wands (2). However, despite my anointment providing me an 8% chance to gain a power charge on kill, I'm never getting above 5 charges.

Can you please explain?

Thank you!

And what does provide power charges with totems, if anything?

Beyond this (for the devs to consider, if they read this), if any given node is not going to work with a totem or whatever, it should say something like "8% chance to gain a power charge when you kill a monster with an attack or spell," or something else that implies totems/whatever will not generate the desired effect.