site security question

Hi Guys,
Maybe I'm being a bit edgy.
But I went to log into the site.
I got a drop down thingy that said that
this site is not secure and things can be
hacked and such.
This never happened before.
Can the site admin tell us what's going on please ?
also I noticed that by the URL on top
there is a RED line through the lock when
I go to the main page.
Please let us know when the site is secure again.
Thanks for all you do to keep us safe.
Best Regards,
Gary