there are older checks of your domain - Grade Q, http over port 443 - iowii.com - Make your website better - DNS, redirects, mixed content, certificates
But that's fixed, now your certificate is correct, two domain names, both connections (non-www and www) are secure.
CN=iowii.com
07.06.2020
05.09.2020
expires in 89 days iowii.com, www.iowii.com - 2 entries
So it's only a mixed content problem, check the #html-content part.
Sample:
http://konte.uix.store/demo-images/payments.png
img with http, same with some style attributes and images.
Change these to https.