Hi there,
I’m sorry to hear that you’re having issues with the ticket quantities. I will try to help sort this out.
I’m not familiar with the interface shown in the screenshot you posted. This appears to be from another plugin. That’s Beaver Builder I’m guessing?
You should be able to safely switch to another theme for testing, but it is recommended to do this sort of testing on a staging install. If you don’t have a staging install, you can generate one using the WP Staging plugin. At the very minimum, make sure to take a full backup before testing.
What happens if you view the single event with Twenty Seventeen theme enabled and all other plugins, including beaver builder, deactivated? Does the correct number of tickets show?
If the problem is within Beaver Builder, you will need to contact them for support, as we cannot provide support here for third party plugins.
Let me know how that goes.
Thanks,
Sky