We tried to make OpenKM as intuitive as possible, but an advice is always welcome.
Forum rules: Please, before asking something see the documentation wiki or use the search feature of the forum. And remember we don't have a crystal ball or mental readers, so if you post about an issue tell us which OpenKM are you using and also the browser and operating system version. For more info read How to Report Bugs Effectively.
This is not the first time I see this kind of error, but for us, it is necessary to reproduce the issue in our development server to discover the reason why happens. Are you able to share an email ( msg or eml ) to reproduce it?
The exact version remains unclear. I have started out with 6.3.0, upgraded to 6.3.1, and then went through all the upgrades (by replacing the war file) up to 6.3.8. The status page still shows 6.3.0, though. See this thread: viewtopic.php?f=5&t=21260
You might remove older webapps/OpenKM and work/Catalina/localhost folders after the upgrade. And then start OpenKM. If you really have changed the war file by 6.3.8 then should be shown, otherwise, you are not compiling the right version.