If you have a Figure's Hip selected; when you save the pose, the new pose will remember the Figure's Hip's Z, Y and Z Transformation(place in Poser 3D Space,) and then apply that Translation to every figure you apply it to.

Having IK on/off also effects how a Pose file is saved.   In General what Figure > IK settings you used to save the pose should also be present in the figure you apply the pose to.