Measure The Right Thing

Recently, I noticed something odd in my kitchen. The “Hot Cooktop” light was on, and sure enough, one of the hotplates was warm. I was initially confused, having supposedly turned the stove off hours prior. The “Cooktop On” light was off, as I expected. Do you see what happened? The offending stove dial. Not pictured is the orange "Hot Cooktop" light. One dial was on, albeit at a very low setting.