Safety of website starred by AVG as untrustworthy

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A website I help program - 1900s.org.uk - is passed by 'Google safe browsing' as safe yet it is starred by AVG as 'untrustworthy'. What can I do to find out why?
Greetings,

We will investigate and assist further.
Are you using AVG Antivirus free or paid version of AVG Internet Security?
Could you share the screenshot of AVG rating the website as untrustworthy?
You can post the screenshot by clicking on 'Image symbol' from 'Answer' field.