That goes back to before I started using InfinityFree (around March 16/17). Before IF, I was using the domain name for a tumblr page. Tumblr takes care of the SSL stuff automatically- maybe they renew SSL certificates every day or two…?
I removed the domain name from my tumblr page to use it on IF and was immediately unable to access it through an https url.
EDIT: What is that screenshot of yours? On my dashboard I only have this:
