Privacy Error on Litchi web sites. Problem with certificate?

I log on to Litchi web sites using a variety of computers and browsers. Right now I am getting a privacy error when trying to get to Mission Hub on a macbook air using google chrome: “Your connection is not private. Attacters might be trying to steal your information…” It gives me a button that says "Back To Safety:
On the same machine, using Safari, I get a different message, but basically it is saying that the website is using a certificate that is not valid.
I am typing this on an old chromebook that is no longer receiving system updates.

This may be a problem at my end. I got the latest update for Chrome on my macbook air, and now it works. I still get the problem with Safari