I don't understand why Jon doesn't lose the $240. Because isn't that what he risked to get his opponent's ("me") $160? Conversely, "me" should've ended up with

I don't understand why Jon doesn't lose the $240. Because isn't that what he risked to get his opponent's ("me") $160? Conversely, "me" should've ended up with $1040 and Jon with $960.