Australian Rugby League Commission (ARLC) chairman John Grant has conceded the bunker needs to lift its game as the NRL's central command centre continues to be hit hard by criticism.

Sydney Roosters coach Trent Robinson was scathing in his comments on the bunker in the wake of the controversial Anzac Day loss to St George Illawarra, saying the use of the technology had led to "soft" calls.

The Roosters have been hit with a $40,000 fine after Robinson apparently approached referee Ben Cummins following the defeat to the Dragons and for his post-match comments critical of the match officials and the bunker.

Sorry, this video has expired Roosters coach Trent Robinson launches attack on referees

One of the Roosters' main concerns was the inconsistency in the use of the bunker, which Grant admitted was an issue.

"We would expect more consistency of our decision making as distinct from the technology," the ARLC boss said.

"There are some interpretations which are suffering through some lack of consistency at the moment and we acknowledge that amongst ourselves.

"One of the benefits of the bunker is to give transparency to our fans and at the moment we are not doing that.

"We are not in sync where we need to be with the broadcasters."

Grant said he could see where the last-placed Roosters' frustration was coming from.

"They are a successful club, they have successful leaders and they are not used to being in the position they are in," he said.

"So I can understand that frustration. But there are channels to air those frustrations."

AAP