Hello @askpet,
Issues like the one you’re experiencing are often due to conflicts between the optimization features of the Speed Optimizer and other plugins.
I was unable to recreate the issue using the free Amelia Booking and Elementor on a test website.
The most effective way to investigate this is to disable all Frontend Optimization features one by one until you identify the one causing the conflict.
Once you’ve identified the problematic feature, you should exclude the conflicting script from this optimization feature, using the appropriate exclusion filter.
Should you require further assistance, I would recommend submitting a ticket from your SiteGround Client Area. The Technical Support team will help you investigate and identify the problematic script.
Best Regards,
Kuzman Stoyanov