Web shield false positive

Hi ,

one of our client told us our website is currently blocked by avast webshield. I’ve tested the url on other online malware detection and could not find anything.
the url reported : https://lp.21sextury.com/track/go.php

would it be possible to know what was detected on that url, currently i would say this was a false positive.

Thank You

https://www.urlvoid.com/scan/lp.21sextury.com/

https://unmask.sucuri.net/security-report/?page=lp.21sextury.com

https://forum.avast.com/index.php?topic=14433.msg1289438#msg1289438