@edbianc - glad to hear that things appear to be running normally.
Apologies for being a bit vague on the zone readings. I didn't want to get too specific, as it was only an initial guess and I'd hate to be an alarmist. Initially, what you reported looked like some of the support tickets I've seen where users go with alternative power supplies (AC is fairly uncommon for these types of electronics, but is required for standard irrigation systems ... go figure)
Your wiring to the controller looks fine from where I'm standing, and - while I can't read the power supply to confirm all the specs match - it certainly appears to be the Rachio-supplied PS. Also, you've been running this setup for some time, right?
I wouldn't expect that to be an issue, normally. Is this surge protector still, well ... protecting? Some are only rated against one good spike, before needing to be replaced. If it's a concern, I'd take it out of the equation, as @mckynzee indicated. Pretty easy test.
Please let us know if you notice any more behavior that seems abnormal. I could easily just be "chasing my own tail" on the electrical side of things, especially if you haven't received any Fault detected notifications ...