Does anyone know why the Earthen Savage Novaraptor is "Not Tradable"? It's not really anything special, so I don't understand why it isn't. At least, it's listed as not tradable in my steam inventory.

Then again, it also lists it as an "Ice blue raptor," as if it were the frostbitten savage novaraptor or something. https://imgur.com/a/XyCv9

Is it a bug?