Elevation Gain to high on 970

Around 3 weeks ago I noticed that my elevation gain was off by 20 to 30 percent. Normal trailers that have showed 1000 feet are showing 1300 . I also noticed that the screen that showed how much elevation in an hour is off too. Even on super steep runs it would read 3500 or 4 k but now it jumps up to 8k . Think my watch is updated. I turned on all sensors too. I have had the watch since it came out .

Thoughts on how to correct?