It scaled the image so that it would fit the proper dimensions, previously 70x70, but now 140x70. It will continue to scale the image so that none of the dimensions exceed the limits. Best bet is to scale the image yourself before uploading so it doesn't end up "squashed" in ways you don't want.
THE CAKE IS A LIE!
I did scale it properly, but it kept changing it over and over. I guess I was trying to make it too tall, instead of wide. We need 140x140!
Give me 140x140 and I'll bring you a cake.