Amelia does not load, caching problem?

I have the problem that the Amelia booking 2.0 does not load automatically, only when the site will be refreshed. I run Amelia under the Bridge Theme which supports Amelia.

Also the catalog booking form. I dont know what to change. Also the german translation does not work, it has been but now its away..

My test booking pages:

https://www.salzkraftwerk.at/salzlufttherapie-buchen-direktbuchung/

https://www.salzkraftwerk.at/buchen-katalog/

Hopefully I get some help to solve this issue of not loading. My business starts soon. No caching plugin is active in wordpress.

But wordpress says: ?Page cache was detected, but server response time is still slow“

2 client cache response headers were detected: cache-control, expires.

Maybe this is the problem?

Greetings, Thomas

The page I need help with: [log in to see the link]