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Hi,
That’s a conflict with the WP Rocket settings, probably with the JavaScript deferring or JavaScript Minify feature in WP Rocket.
Please try first changing the “script load method” to “Direct” in the troubleshoot area of the plugin (located under the Appointment Hour Booking menu >> General Settings >> Troubleshoot).
If that doesn’t work then try excluding the booking page from those WP Rocket Optimizations.
Note: Remember to clear the server side cache after changing the settings.
Thank you for using the plugin!