Poser Changing Params after Save

Does anybody know why this happens?
I will have an animation that I want to make work for short people, so on Frame 2 (let's assume it's a 2 frame animation, frame 1 is T pose) On frame 2 I move the hips wayy down to lets say Move Down -2, Then I Export as BVH, and it saves correctly so that i can see it in SL how I want it, but in poser the Hips snapped back up to, 3 or , somewhere else. This makes it hard to eye it in Second life and say "Hmm it needs to be just a LITTTLEE Higher" and move it up, unless i've written down the coordinates from before. This also happens when i move the hips in Frame one. And Sometimes i've noticed that I will copy the first frame to the last frame, save it, and export, and then i look again and the last frame hasn't been copied, like it snaps back to a previous....? I'm not sure.

Does anybody know why this happens, or what I'm doing wrong?

Thanks

I don't know if I quite understand your problem.

Poser 7 does have a bug with Export to BVH, in that sometimes after you Export, the last change to your file will be undone. But this bug will not change your saved Poser file, if you saved before you Exported.

If you have scaled the figures you are using in Poser, using the "copy figure" function does not work quite right (or at least not as I expect). Using "Copy Figure" seems to mess up any scaling I have on the figure. I don't remember exactly, but it also might have changed the up-down position of the figure as well. I don't know why this occurs, and whether it's a bug or a feature or something that I'm doing incorrectly. But my work-around is that I do not use the "copy figure" feature. Instead, I save the figure's pose in the library then re-apply the pose to the next frame. Doing that doesn't mess with the figure's scaling.