Hello again 🙂
I found the source the of the problem! It seems that the widget is working normally in the sidebar. However, I’m using a pagebuilder (siteorigin pagebuilder) and I tried added the widget into the pagebuilder which should display the mini calendar in the page body. It seems that this does not work correctly. I tried using the shortcode in the body and that worked correctly :).
I’m not sure if this is intentional or not but the events calendar mini widget does not work in the page body unless you use the shortcode. specifically I had to do this:
echo do_shortcode('[tribe_mini_calendar]');
Hopefully this info is helpful!