Wordfence error | WordPress.org

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It does affect all the pages, not only the page mentioned. To be fair I’m not sure exactly what is it, but I’m using Wordfence on other websites and nowhere else I see this on the page source.
Is this a security breach or something? I don’t currently have a developer anymore and I cannot sort this by myself, unfortunately.
Please let me know what’s the issue and how can i sort it out.
Regards
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