Could you be so nice to suply a screenshot or even movie (if you have recording software),
I can't quite see the error or mistake. I myself tried it, nothing 'strange' happend.
But, you want a non morphing to an upright stance, and a non-skin changing good tiger. That is exactly like the base tiger?..
The only way to get that, is to replace A_Tiger2_good.l3d, with A_Tiger2_base.l3d, and rename it A_Tiger2_good.l3d.
I'm sorry that I can't help you any further. I would suggest getting the backup from this site, as it seems your A_Tiger2_base.l3d is corupt, or your Allmeshes.anim.