Mistake at the Module Type "Page Builder CK"?

Hello,
I created a module of type "Page Builder CK". Everything fine.
But if I specify a class under the CSS class header, then it is not adopted.
Since the website is already up and running, I don't want to post the URL here. If necessary, I'll be happy to send a PM.
Greetings
Sven
 

Hi
are you talking about the "header class" option in the advanced tab ?
this is not managed by Page Builder CK, but by your template. Does this work for other modules ? if yes, are you using the same module style as others ?
CEd