Lost my Design Set after finish my site

i have built an complete Website and create an Design Set before (Container Width, Fonts etc.). It works nice for me.

But now, since yesterday, when I open a site to work on it, the Design Set isn’t active. When I selectet it again and save, leave the site and go again to the site → the Design Set are not active.

What could be the reason for it.

Thanks for any answers.

I found the error myself. When creating a search results template, I set the condition to only the search results page. Now that I have set the condition for the entire website, everything is ok again.