I believe the specific offending joints to look at are lFoot, rFoot, lShin, rShin, lThigh, and rThigh... these locations have all been set to default bent as part of the base cr2 to get that bent kneed pose that the V4/M4 figures load in... As said by Icprncss, don't change the names of the joints... you'll want to look through the coding for each of those areas to find the bend settings and change those only...

I copied the base figure c2s and relabeled them as "BlankVicky" and "BlankMike", cleaned out all the built in morphs and deformers, and got rid of the default preset bends and keep them aside to use in figure development because of this exact problem...