Interesting suggestions. The camera that received the upgrade is definitely older than the other two; it was a preorder from when the program was first announced. The other two were purchased much later. I would have to assume that the camera that received the update has an older board revision. Wouldn’t all three cams update at the same time, since they are controlled by the same app?
It is definitely a BETA firmware, but not the latest BETA firmware. The latest is 4.36.3.19; the one I received was 4.36.3.18.
I found that info in this thread: