Good evening afternoon David and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We are sorry to hear about the browser tab showing a single event’s name.
I would love to help you with this topic.
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/
With that in mind, this sounds like it is theme-related.
Try temporarily reverting back to a default WordPress theme such as twenty-sixteen to see if the issue remains ?
If my theory is correct, you should be able to fix this using the following: https://theeventscalendar.com/knowledgebase/calendar-page-shows-event-title/
Let me know how that goes.
Best regards,
Geoff B.