Error 1001 on Cloudflare for a site that is not on Cloudflare

Hello,
I have a site purposeimpact.se that has been hosted by MissHosting but is redirected to Mighty Networks and it has worked fine until now. All of a sudden I first get a message saying that “The website cannot provide a secure connection”

When contacting Mighty networks they say that everything looks ok from their side and when I then contact my domain provider they say that it looks ok there too. I then get a message saying that there is a Error 1001, DNS Resolution Error on the Cloudflare network. The problem is that I have never heard of Cloudflare before and I don´t have an account on Cloudflare.

I am now stuck in between all of these suppliers and don´t know what to do. Can anyone here please help me?

Best regards
Helene