Hi BJ!
Thanks for coming back to us!
I’m sorry you are having that issue. Let me try and help you out.
I don’t see anything strange in the shortcode you are using, and it seems to be working fine as I can see the Month calendar showing the Youth Activities category.
That strange text seems to be from something different than the calendar. It may be a theme or plugin conflict of some sort, so could you please go through the testing for conflicts guide and let us know what you can find in the process?
Thanks!
Victor