Course elevation oddities

I just created and saved a course in connect.garmin.com. The elevation gain on the web site shows as 1894 feet. I downloaded to my computer as a gpx file, then copied to the Edge 1030, and the course shows an elevation gain of 0 feet. As an alternative, I used Garmin Connect on my iPhone connect to transfer the course to my Edge 1030 (under a slightly different course name) and it shows an elevation gain of 4308 feet.

It seems odd that the elevation gains don't match at all.

The Edge is on firmware 5.0. Garmin Connect on my iPhone is the most current version.

Any ideas?

Thanks