Hi Cormac,
Thanks so much for reaching out!
I’m using the WordPress default theme, ‘Twentyseventeen’, and I see navigation at the top of the Calendar, as well as the bottom of the calendar.
Can you run a quick test and see if switching themes helps to bring back that navigation to the top of the menu?
In the meantime, I’d recommend taking a look at your stylesheets and page templates and see if altering these settings helps you to achieve the results that you are looking for:
https://theeventscalendar.com/knowledgebase/stylesheets-and-page-templates/
Let me know what you find!
Thanks,
Jaime