Caster's Stance does not have an infinite life time

I have an adventurer that I have used Caster's Stance on. After some period of time, the effect fades without warning. Is this expected? My understanding was that the stances were supposed to be permanent until you cast the other stance. I haven't tested combat stance to see if it has the same behavior.

It's important to note that these stances only work on the display anyway and do not actually get calculated in. They are more or less still unimplemented.that aside, Your stances for some reason can be dispelled by enemies, may be a factor in what you're experiencing.