Dear Sebastian!
You can DELETE those files, because they are not loaded in the header. The reason you see the icons from my server, because the style1-8.css files are not writeable, and the default values are not changing when you save the search, trust me. The style1-8.css files are generated from the style.css.php when you save the corresponding search on the backend. It doesn’t matter what is in those files, they get overwritten if they are chmodded properly with your site url with the https tags and so.
Once again, please enable the Force inline styles on the Compatibility options tab (https://i.imgur.com/K6uolR5.png) and you can delete the style1-8.css files from your server. This way the styles wont load from the unwriteable css files, but will load in an inline safe stylesheet, and all the icons/images/png and gifs will load from your server. That is the safest option for an ssl enabled website.
Also if you have a cache plugin enabled, don’t forget to clear the cache after changing the search options.
Here is the search with the deleted style.css files in case you don’t want to delete them manually from your server via ftp.
Best,Ernest Marcinko
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