Hi Sebastian,
I have looked at the issue directly, but this is much more complicated than I thought. The theme seems to be doing some sort of a reloading of the nodes (it does not do ajax loading).
However some of the code does not seem to be executing correclty, causing major issues.
Can you please add temporary FTP details? I would like to debug the plugin scripts directly, to see if this is something I can fix from our side, or the theme needs to be adjusted.
Thank you!