He has a pic on his work's website and it appears to be on the right hand (not linking here! Google it yourself)
So either he swaps the ring from one hand to the other or the it's an image flip thing. Now it could be that the ring belonged to his dad or something but still a bit odd. I have two inherited wedding rings but I don't wear often, never before I was engaged myself and only on my right hand. I find when you're young 'of marriageable age', people notice stuff like that quite easily and aren't shy asking