This latest one has short-looking arms.
When you use DesignDoll, are you using it to understand the structure, or to copy from? If the latter, then it's quite easy to accidentally create inconsistent or incorrect proportions because you might render parts of the body in way that make them look like they're at a different angle than the ref. Poorly done foreshortening can lead to wonky limbs, and DesignDoll, being 3D software, will almost always have some foreshortening somewhere that you might not be noticing and therefore not depicting clearly.
In addition to that, with pixel art you don't have room for the subtler details that make things look right. The difference between an arm being too long or too short could be a single pixel, where exactly you put the sleeve can determine whether the arm looks foreshortened or not, and so on.