Cambridge director of rugby Bob Crooks insists his men do not lack discipline, despite conceding 22 penalties in Saturday's win over Blackheath.
Crooks blamed the infringement count on referee Matthew Carley after his side's 42-27 victory.
"How can you," he asked, "reach 10 games conceding only 10 penalties twice and then get 22 in one game?
"That suggests it's not the team, because we're consistent, it suggests the referee didn't manage the game."
Victory maintained Cambridge's 100% home record against Blackheath, lifting Crooks' side to third in National One.
But he told BBC Radio Cambridgeshire: "That was one of the most bizarre refereeing performances in a long time - in my memory.
"There was no consistency. It seemed to be a little bit one sided at times and you start to worry."
Cambridge now travel to leaders Ealing this Saturday (5 November, 1500 GMT) but Crooks is unconvinced by the London side's lofty position.
"Have they played us? No," he said. "Have they played Macclesfield? Have they played Fylde?
"I don't think they've played top sides yet. So let's see, we'll have a look and we look forward to it."