New password Key Symbol/drop box appears

Hi All.

Since the last Safari update on Sept 30th when I log into one or two of my Frequently visited sites I have a little key symbol in my password box like thisThen if you click on the little key you get this and when you click on the word Passwords you get a drop down box like the one in preferences, but instead of having to click show passwords and entering your security code, ALL of my sites and their passwords are showing. Why is this happening I do NOT want my passwords showing to anyone who uses my computer.

Does anyone know why this is happening and how do I stop/get rid of it?

Thank You.

Tricia