Export as TCX Course: elevation 15x in Wahoo

Hi there. Came across a strange quirk with TCX course export. I'm syncing to a Wahoo Elemnt ROAM, and when exporting with elevation data from the website (have clicked the elevation profile button before exporting), when it comes through to the device, the total climb is about 15x the actual elevation.

As an example, here's a route I rode at the weekend: cycle.travel/map/journey/876470 . Total climb in cycle.travel is 680m. On the Wahoo (both in the app, and on the device), it reckons at 10215m! Screenshot from the Wahoo app is below.

When riding, the device then obviously thinks that I'm doing a superhuman effort as it reckons all climbs are 15x higher/steeper than they are...

As an aside, exporting as a GPX route does seem to work successfully.

Wondering if you've seen this before, or have any insight? As there's a workaround of using a GPX route, not a huge deal, but it would be good to be able to use TCX courses too.

Thanks!