Hello wouldpreferemailsupport,
Thanks for using our plugins and for reaching out to us with your questions. Let me help you with them.
If you purchase Events Calendar Pro, then you will be entitled for plugin updates and support in our pro forums for 1 year. After your license runs out you will not be eligible for either of them. Also note, that usually we offer discounted rates for license renewals.
You can read more details here:
What Kind of Support Do You Provide for Paid Plugins?
Based on your description, my first hunch is that this will be a theme issue / conflict. We can and will try to help you solve it, but we are limited in supporting customization.
Let me know if you have any further questions.
Cheers,
Andras