Thanks so much for reaching out!
Can you take a screenshot of what you see there, with that extension activated?
I just checked on my test site, and the extension seems to be working as expected.
As a first troubleshooting step, could you please provide us with your complete system information in a private reply using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
Can you please also enable WP_DEBUG and WP_DEBUG_LOG and share any debug messages you see?
Let me know if you have any other questions in the meantime!
Thanks,
Jaime