How long did you sear the roast? A 25* cook is long for the sear. Though I sear at 500*, the roast is usually in the oven for 5-6 minutes.
I smoke my rib roast till 120*, let it sit to cool for 30 minutes, then sear just to improve the bark. It rises a few degrees with a quick sear. My guess is your sear was the culprit.