Arsenal fans were quick to take to social media with their frustration after West Ham took an early lead at the Emirates.
After Bowen seemed to keep the ball in play, Arsenal scrambled to clear the ball, though their players believed the ball had gone out of play.
With the confusion on the pitch visible, Tomas Soucek capitalised and netted the opener to put the visitors 1-0 ahead inside the first 15 minutes of play.
Fans were reminded of Arsenal's 1-0 defeat away at St James' Park in which Antony Gordon capitalised off the ball seemingly out of play from Joe Willock's pass.