Hi! I wonder if you have taken your measurements? It might actually be coming off there too, but it may just be harder to tell for some reason?
For me it feels like I am *only* losing in my butt and waist, and I still feel like my arms and shoulders and chest are like they were before. They aren't of course, they are smaller, but I am not zooming through the sizes of tops like I have been in pants. In November I was a 24W, and the other day I bought a 16W in jeans. I mean WTH?! Tops though I am still definitely an 18/20W.
The whole experience is kind of weird, but the only thing we are in control of is our eating and our exercising -- everything else is just going to happen as it happens! Good luck!