Recently I have notice that the Elevation information on Garmin Connect is incorrect. After my runs I have like 20000-30000-50000 feet elevation gain which is ridiculous. When you do the math between Min Elevation and Max Elevation the math does not match what is stated by Garmin Connect. Another problem is the elevation graph, on my yesterday's run I have min, max, gain, and loss elevation but the graph is a flat line. This was working before but now it is not. I just checked other recent runs and I have the same problem, my last activity to have good elevation information plus the graph is July 29th. So something happened in August.
I have a Garmin 910XT 3.00 and all the information is fine. It looks like the app is not collecting/interpreting/graphing the elevation information correctly.
Also I have to use Elevation Correction button to have better results otherwise it shows unrealistic information.
Garmin Connect team, please correct the problem