Hello look at the topic. 4SEO reports e.g. an 404 on "stochastik/erwartungswert-fortgschritten-aufgabenblatt01" see image:
When going to sh404SEF this URL cannot be found.
To trace this. Just one second before looking at broken links I purged all records within 4SEO. After this had been done, I immediately looked again at broken links and found the above. I think it unlikely that in just this little moment somebody entered the not existing URL into frontend.
Could you please explain the reason? Thank you.
Kind regards Meinolf Müller