Hello,
I’m sorry that you’re running into this issue. Do you have a testing environment set up? If not, then I would recommend getting one set up – the free WP Staging plugin can help you create one if needed.
In this environment, can you re-enable the current versions:
The Events Calendar 4.6.21
Events Calendar Pro 4.4.30
WordPress 4.9.8
It’s possible that the current versions aren’t getting along well with something else on your site. To start, you’ll want to run through the steps outlined here to check for this.
You’ll also want to check for Javascript errors on the page by right-clicking, clicking “Inspect”, and looking in the console while you try to recreate the issue. If you see any errors, please copy/paste them into your reply.
Let me know what you find! If you can send me a link to your testing environment, please do so that I can test it out on my end.
Thanks,
Jennifer