Error in Backoffice

Hello, I got the following error on the site, shown to me in the backoffice:

2026-05-06 01:33:35: Geplant: scanner__launch: “WRONG_SITE_RESPONSE TEST_ACTION FOR RC scanner__controller, ERROR: UNEXPECTED RESPONSE: \u0022\u0022\u003C!DOCTYPE html\u003E\\n\u003Chtml class=\\\u0022touch\\\u0022 lang=\\\u0022de-DE\\\u0022 xmlns=\\\u0022http:\\/\\/www.w3.org\\/1999\\/xhtml\\\u0022\u003E\\n\u003Chead\u003E\\n\u003Cmeta http-equiv=\\\u0022Content-Type\\\u0022 content=\\\u0022text\\/html; charset=UTF-8\\\u0022\u003E\\n\u003Cmeta name=\\\u0022viewport\\\u0022 content=\\\u0022width=device-width, initial-scale=1\\\u0022\u003E\\n\u003Clink rel=\\\u0022pingback\\\u0022 href=\\\u0022https:\\/\\/kernbeisser.ch\\/wordpress\\/xmlrpc.php\\\u0022\u003E\\n\u003Cmeta name=\u0027robots\u0027 content=\u0027index, follow, max-image-preview:large, max-snippet:-1, max-video-p\u0022\u0022”

Anything I can do about this? Happy to get any suggestions.

The page I need help with: [log in to see the link]