Today, I am getting more NOT SECURE messages.

[orwell]

1. This can happen when...

...things like photo images or links are connecting in an insecure manor to a remote server. It can be something as minor as an out of date security certificate for the server that houses that image. If you left click on the little lock it will tell you what triggered the security warning.

This is rather common with the security levels of modern browsers. It is not necessarily a cause for concern.