I suspect this has been reported already, but anyway: charm person cast by harpies make your char make random things, like drinking a potion, and even using an AoE item on a random spot, in addition to dazing. There was one occasion when the spell simply made my pc attack another harpy than the one who cast it.
Are you sure it's charm and not some sort of confusion?
Why is this a bug?
Charmed, I am sure.
It's the 1.69 version of this spell.
Those harpies make you do all kinds of crazy shit if you're not warded. Good stuff.
PvE, Potion of Duty. Exit harpies.
Make more room for clarity or mind blank, imo.