Widnes Vikings coach Denis Betts has criticised the decision to allow Wakefield Trinity Wildcats' winning try in their
Tim Smith's score edged Wakefield ahead after the break, setting up Widnes's fifth loss in six Super League matches.
Betts told BBC Radio Merseyside: "They got in front with a try which I don't believe should've been allowed as Richie Moore's offside.
"The lack of consistency's frustrating - those things are seen every week."
The visitors led 4-0, but the first points of the second half saw Smith pounce when Vikings prop Alex Gerrard spilled the ball in a tackle made by Moore.
Referee Ben Thaler sent the decision to video official Richard Silverwood, to check the grounding and for a knock-on, but not whether Moore was offside at the previous play-the-ball.
Wakefield went on to make it five games unbeaten since
"The officials should see that offside. I could," added Betts.
"It's another frustrating night for everyone. Consistently Wakefield's defence was offside, then their winning try shouldn't have stood.
"That's hard to take, but the reality is we're having a tough run of things."