Refresh of Webpage

on my sitemap is a page for all lights in my house (defined by a group)
This morning i cheked it and i saw that my wife is at home and has 3 lights on.
an hour later the page was still opened she left the house and switched them all off.
The top of the page says “0 Lights on” bute on the page are the lightswhich were on still lighted…