Hello,
Chrome does not allow to check your site https://recordit.co/GfIAeumAt5
I was able to log in using FF but take that moment into account for your future customers. I would recommend you to contact your hosting provider about SSL issue for your site when you check that in Chrome.
About Query Monitor errors.
You used our of date code in child theme functions.php https://gyazo.com/5a0d107ca39dc5cf43bb8f3ceca5dd44 I have updated that and there are not any errors anymore. Check now, please.
Regards