checking your domain with Chrome there is no error visible.
Is your Chrome up to date?
May be a temporary problem if you create and install a certificate.
Same (no problem) checking your domain via https://check-your-website.server-daten.de/?q=refletirpararefletir.com.br
The new certificate
CN=refletirpararefletir.com.br
05.12.2019
04.03.2020
expires in 90 days
refletirpararefletir.com.br, www.refletirpararefletir.com.br - 2 entries
is used.