Hi there,
Now I can see the issue, I’m sorry I didn’t realize this before! One of our users reported the same problem: If you click on “December” link, it changes the calendar view to December and also add a filter to display only the events with “keyword” in their content. In that case, they found out that the cause of the issue was a theme conflict.
To get started, I would recommend you to run a conflicts test as well. You can start the test by temporarily deactivating all of your plugins (except Modern Tribe plugins) and changing your theme to another one like Twenty Seventeen and let us know if the problem is solved after that (don’t forget to backup your database before changing anything).
Thanks!
Patricia