ILIKECAPS

Actually I think the reason for the bigger arm problem is that the vanilla in-game models have one arm that's bigger than the other. So it's not really a bug, so much as an error that the developers overlooked. Though I do find it annoying that there seems to be no mod available that corrects this, but then again I'm not a modder so I have no idea if doing so is easy or not.

I know this thread has been quiet for a long time, but I too am having this problem and I haven't found any fix for it.