Hi,
Thanks for using the Events Calendar.
Here on the pre-sales forum, I’m afraid we do not provide technical support. I would ask that you take any technical support questions across to our wordpress.org forum – our staff scan it periodically and other community members may also be able to help out.
The Events Calendar
Before posting there I would run through our testing for conflicts guide and see if that narrows down the cause:
Testing Conflicts With Themes and Other Plugins
Thanks again!