I'm 100% sure it was a small rat. No doubt at all! I'm going to reweigh her once I get home. If you guys want me too I will happily offer her the same meal as she had last time after this one fully digest. I know the difference between the rats at first I would feed her rat pups. The only reason I got a small rat was because the rat pups were out!
Most likely just a broken scale. But if it would help clear things up for the thread, taking a picture of your BP next to a ruler, and then taking a picture of the small rat next to a ruler (separate pics, so the BP won't flip out into feeding mode), would help!