VIDEO: We can’t figure out why the linesman disallowed this goal? Can you?

It's not offside, nobody was fouled and the ball was clearly a yard or two in play.

So why the flip (excuse the profanity) was this perfectly good goal disallowed? Melgar midfielder Eduardo Uribe scored a goal that we see relatively often in football whereby the wind takes a cross, the goalkeeper loses the flight of the ball and boom, we've got a goal. But the panicky linesman raised his flag inexplicably when this effort went in on Sunday. Answers on a postcard ladies and gents. https://youtu.be/OAnSlnBZa8s