Charms are not consistent

Why am I getting stunned and killed when I have a stun charm on with full charges?

Why does my rarity charm not always use a charge when I kill a rare?

Why are charms inconsistent? Is there a bug that we need to fix? I am tired of getting stunned and slowed and killed when I am wearing a stun and slow charm.

The more I play this game, the more I feel like the dev's cannot beat players on an even field so they literally cheat kill people. "Oh, this will be sweet, nobody can counter this move!" MUAHAHAHAHAHAHAAAA!!!!

98% of the way through a map, and get cheat killed by some new monster pack that is SO far overpowered compared to the rest of the monsters on the map that it feels like a setup, then, the charms don't work.