Meters have a margin of error of 15%. So even when you test from a single drop of blood, there can be a difference. Also, it may just be a bit of a morning liver dump getting in the way, or maybe the walk was a bit too strenuous, something stressful came up... But really, my bet'd be a little glucose dump, courtesy of his liver. If it's dumping stored glucose though, and he's not putting any back in, (yay for eggs!), it should come down eventually. But the morning blood sugars are the last to come down, and the dump can be a bit erratic. Nothing to panic about just yet though. Give it time, see whether it improves.