Good idea, Santolina.  Another possibility which occurs to me:  I don't know if you used a background prop which would serve as a point of reference, but if you used the face or pose cameras, they are parented to the selected doll by default, and will move with the doll even though the camera has no keyframes applied to it.   If this is the case, use the dolly or main camera instead.

The problem is not familiar to me (and I do quite a bit of animation in Poser).
Well, silly animation, but nonetheless...

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5