It was brought to my attention today that https://diasporapod.no some times redirects to https://gnusocial.no - I host both on the same server. If it happens to you - then make sure you log in via the correct https:// url. I'm working on solving it.
Sorry about the confusion caused by this.
I work on fixing it as soon as possible (in between family life and work) - so it might take a little while to figure out exactly what goes wrong and how to reproduce it.