Hey man, that sounds like you're gaining muscle while losing fat.
Thats quite an accomplishment! Especially considering that most of us lose muscle and fat while cutting up.
Anyways, get a pair of calipers and keep track of the size of your fat pinch instead of the scale numbers.
Arnold was 240 ish in contest weight. The average person that weighs 240 in America is a FATTY.
But yeah, theres a good BF% calculator on bodyforlife.com that lets you enter millimeter measurements from your calipers on dif spots on your body.
hope I helped