Same thing happened to me
Check your Alexa app.
There’s an option called “Away Lighting” - be sure to toggle it off.
And make sure you click the three dots next to term “Away Lighting” and click on “Lights Alexa Can Control” and uncheck everything.
“Away Lighting” is a function that turns different lights on and off to make it look like someone is home.
I never turned it on,; it must have just automatically defaulted to “on” during an update.
