Many thanks for your reply.
I have the problem that the search does not work. The circle in the searchbar rotates but no results will be displayed. I disabeled my caching plugins (autoptimize and wp-rocket) and deleted the gzip and deflate in the htaccess but still it doesn't work.
How can I debug the problem ?
Or can you have a look at my installation ?
My website is http://www.depasco.de.
Thaks and best regards,