Animations changing after they're dropped into AO

I have an AO HUD with modify rights, and some animations that I purchased. After I put several sit animation inside the HUD, the animated sits change, so that I am sort of "hunched over". Does anyone know what would cause this to happen? This has happened twice now, with two different HUDS and about 4 different sit animations.

Some extra details:

AO HUDs used:
SEmotion HUD
Bright AO HUD

I checked to make sure that I am not wearing anything that would conflict, like shoes with a built-in AO, or any other HUDS...

Any thoughts?

You didn't try using the AO sits while also sitting on a sit poseball, did you? It sounds like more than one animation playing at the same time. It's also possible that when setting up the AO notecard the wrong seperator character between the animation names was used, causing more than one animation to play at once. Hard to say..

It seems exactly like two animations playing at the same time. And no, I am not sitting on a poseball. I rezzed a standard box prim and sat on it to test my animation in the AO...
The other animation is a ground sit - no poseballs were sat on, I just sat on the beach.

All the other animations work in the AO Hud, which is strange. It's just two or three that aren't working properly...