Yesterday I went on a Zwift ride in Insbruck, I took 2018 UCI Worlds Short Lap. The overview says "23,6 km, 247 m altitude.
In realtity it was nearly 500 m altitide. It ist not the only course with wrong given altitude, it’s also in London and Watopia.
Is your Zwift app the latest version?
If you take a screenshot today, does it show the same incorrect information?
The App is the latest version. Today I can’t see Innsbruck, but I know, that the course "Greatest London Loop), 25,9 km, 179 m altitude, has more then 300.

