The image makes perfect sense if you read it in the order 3, 1, 2.

OH!

I was assuming the joke was that 1 and 3 got swapped around. Because it doesn't really make sense for 2 to be mixed up, considering it's from a different person entirely...

Which meant that the joke just made no sense, because swapping 1 and 3 is just as nonsense as the original order.