Need more training

Was hoping for a slightly quicker time but it's still not too bad. Got to keep up the training.

What is the actual elevation climbed on this ride? My garmin reads 857m as does Strava when I upload it there but when I upload it to Garmin Connect, it changes to 1200m ish. I presume this is because of Garmins error correction but still, that's quite a difference!