Hot Topic's cake doll has some messed up arms. This wasn't a one time mistake, I've been to a few Hot Topics and kept seeing this bad version of the toy. Guess quality control wasn't an issue in whatever country had to make these.
You can clearly see they added fur to Cake's right palm and it's missing the fur up her arm, no idea why hot topic doesn't demand better quality products. If this is Jazzwares doing( the same makers of the action figures) maybe start double checking your work, because I also have a Finn action figure whose knee joint is in the wrong direction.