Hey Jarkko,
The Suomi page does not really save with or without the shortcode so the cause is different now.
There were errors in the console caused by Google Maps API which was coming from UberMenu; I disabled it but the issue with saving still persists even though there’s no more errors in the console.
I then went back to the page editor and Cornerstone outputs the generated shortcodes in the content but it fails to save the builder’s data which is the one that will be read in the front-end.

Something is causing that but I’m currently not sure what is. Would you mind deactivating all third party plugins to check if there’s a conflict?
Please also give us FTP access maybe we could find the cause by viewing the error logs and your setup in general.
Thanks.