Noonlight alarm tripped, no sensors tripped

I have a alarm panels and the Noonlight alarm monitoring.
The noonlight alarm looks like a virtual switch.

Twice in the past week, Smartthings has switched on the virtual switch, triggering an alarm condition to Noonlight.

None of the monitored sensors have tripped.

Also, I noticed one other light switch was turned on at around the same time.
Is anyone else seeing Smartthings randomly deciding to switch things on?

Any ideas on how to debug this?