I hope I am in the right place with my problem here.
I am using an Huawei P20 Pro, the Sketchfab-App (and Chrome - same problem) and the Google-Cardboard (Standard edition).
In the Google-Cardboard-App everything works well - the Cardboard is correctly selected, the view is fine.
Now using Sketchfab - I only see an extreme double-view - impossible for watching 3D Models. I already re-installed both apps - nothing worked and i have really no idea, whats going on.
(Sorry for my english)