Many of my websites (https://www.clean-water.fr, https://pompes-funebres-lefevre.com) uses Cloudflare SSL and starting this morning I just noticed they have “invalid SSL”. It works when I first set up configuration and don’t really understand why it does not work anymore. I’on on Full SLL for both of them on free plan.
What does your SSL status say in your Cloudflare dashboard? It would seem as if your Cloudflare certificates were revoked for some reason. Can you post a full page screenshot of your Crypto page on Cloudflare?
I cant tell whether it is also on an issue with your server certificate, but the primary issue is that it appears the proxy certificates for your domain have been revoked (e.g. https://crt.sh/?id=1359708349).