DEM data missing in baro plots for Norway

[scalvin1]

Describe the bug
No ground level data in baragraph plots in Norway.
For all points, AGL=MSL.

To Reproduce
Take a look at this flight, for example.
(https://www.weglide.org/flight/188759)

[scalvin1]

This happens at exactly 60degN.
I know this effect from playing with SRTM3 data.
See this flight: https://www.weglide.org/flight/194022

Using srtm30 world DEM

Using srtm3 data set

[samuel-git]

Thank you @scalvin1 for the detailed report. We are aware of the issue but it has low priority at the moment :-)