It looks like this post contains a link that does not use a secure protocol (HTTP is in use instead of HTTPS):
http://www.papillonfoundation.com.
Be careful and do not enter sensitive information in that website as your data won't be encrypted.
It's also a good habit to always hover links before clicking them in order to check where they are going to lead you.
More info on this service here. For more information on HTTP unsafety read: https://whynohttps.com https://web.dev/why-https-matters{average of post/comments with HTTP links I found per hour: 43.7}. These auto-reply is throttled 1/20 to reduce spam but if it still bothers you reply "OFF HTTP". 
My apologies, as our website is donated and I will get the webmaster to change the http to https.
Note that is an old website, but it is authentic!
No one has complained about it before and that's why I didn't know about it.
We use it regularly!
Thank you for the advice @keys-defender