App calculating active calories incorrectly

Since yesterday, the app has changed how it calculates calories from my walks. It went from estimating about 220 calories for a 2 mile, 40 minute walk to saying a similar walk on the same exact route is 95 calories. My half mile walks went from 55 calories to 18. I am having to manually enter calories estimates off of past walks. What changed? (I am using the continuous tracking when walking with heart rates over 130 on average)