WP Hummingbird not correctly configured?

Hello guys,
I hope you are doing fine today!
I have tried to configure your hummingbird plugin to improve my website performance. Although there are some problems that occur with it, e.g. here: https://www.sportbachelor.de/news/. Could you please check the correct functioning and adapt it correctly?
I have opened the access to my page.

Regards,
Christian