Hi there,
Thanks for reaching out to us! I’d be happy to help you.
There might be a conflict somewhere. Could you try to deactivate all plugins except for The Events Calendar and Events Calendar PRO, and check again if the problem persists?
Then, could you switch back to the default theme (Twenty Seventeen) and check again your events in your Calendar Pro pages and widgets?
Before doing anything, I would recommend you to read our documentation about testing for conflicts. And ideally, you would run your tests on a staging environment.
Please let me know how it goes,
Cheers,
Jeremy