Issues with Webshield

Every time I go onto a secure website https://brandregistry.amazon.com.au/ I receive a warning that the website contains MALWARE.
I have made multiple enquiries with Amazon and they assure me that there is no MALWARE on the site. I have also checked with VirusToal.com and it says that the site is clear. Does anyone know why this may be happening? I don’t want to disable webshield.

TY

You can report a suspected FP (File/Website) here: https://www.avast.com/false-positive-file-form.php