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Ascent remaining totally wrong

When I create a ride on Garmin Connect or another app and then send it to my 530, the device displays 2x or 3x the acent calculated in Garmin Connect.

Example: Garmin Connect ride with 1000m ascent is shown on device as 3700m remaining and I know what I am riding and I'm definitely not doing 3700m!

How can I fix this?