Purple is vanilla personal armor, red is vanilla coveralls (recolored).
The arms for the south walking animation (weaponless) seems inverted.
I checked the power armor and it matches the coveralls position, so the personal armor is the outlier.
If frames are layered on each other to draw the whole unit, the arms (presumably of the personal armor) might be rendered in the wrong order (layer order). Because the draw routine is the same.
Unless my personal armor sheet is wrong...