The Hammers saw a goal early in the second half ruled out for offside against Michail Antonio after long-delay VAR Jarred Gillett to assess the incident.
West Ham found the back of the net after Brighton goalkeeper Robert Sanchez kicked the ball into Craig Dawson, who sent it towards goal via a touch from Shane Duffy and Antonio, who was ruled offside .
The Brighton defender appeared to get the finishing touches, although the goal was still ruled out.
“I would like someone to clarify that and tell us why,” Moyes said.
“We are in a sport for scoring goals. I actually think the referees and VAR have been good this year, but why would VAR rule something out… if they have something clear and a picture, no problem , I accept that, but everything I have watched so far, there is certainly nothing clear and they ruled out the lens because of it.
“We’re in the game for goals, we’re not in the game for people in a studio elsewhere to make that call.
“I don’t think the referees are ever involved in offside decisions, that’s why the referee didn’t go to the monitor but I think the ball comes out of Shane Duffy’s leg and goes in but
“I would like someone to explain to me the reasoning they did not give to the goal.”