In the last month or two the URL format for posts (“url” column in the CSV) has changed. It used to always be https:// now it is http://.
Probably related to the change where email goes out with all the URLs as http:// instead of https://
That would put the date on or after June 30th and on or before July 6th.
(This is happening to email from Let’s Encrypt:
A brief summary of <a href="http://community.letsencrypt.org"
style="text-decoration: none; font-weight: bold; color: #006699;; color: #0088cc"
>Let's Encrypt Community Support</a> since your last visit on
Did you fix something? My most recent Let’s Encrypt digest arrived with https URLs back, and testing here the https urls in the post download CSV are back.