What model number of switch is it? Is it the GE 14284? GE 14285?.
Some devices such as bulbs will automatically turn on if they lose power and then power is reapplied. I’m not aware of this being the case on any plug-in switches, but it is possible.
It may be a malfunctioning switch.
Light switch activity is not an option to trigger notifications at this time, although I’ve actually recently pushed this as a request to ADC.