Looks like you've fixed your problem. The issue on our side is that we support images of 32x32 pixels in size. If either dimension of the image is larger than 32, we resize to 32. Thus, in your case, we were distorting your image because only the height of your image was larger (63 pixels). The solution is to make your images 32x32 and it will look fine and no scaling will occur. On our side, we'll change our code to scale proportionally in the future.
Thanks for your help with this issue.
Mike