Newcastle Falcons director of rugby Dean Richards says he was puzzled by some of the refereeing decisions in their 26-14 win over Leicester Tigers.
Victory lifted Newcastle off the bottom of the Premiership table, and they are now four points clear of danger.
"We were in the box just bewildered by some of the refereeing decisions," Richards told BBC Newcastle.
"In the first scrum their guys were crawling up the side of the scrum and we get penalised - and you wonder why?"
He added: "But at the same time you have to grin and bear it and come through it."
The Kingston Park outfit have now won five consecutive games at home in all competitions, including recent Premiership wins over Bath and fifth-placed Harlequins.
Having failed to record a league win prior to New Year, Newcastle captain Will Welch is encouraged by their improving home form.
"It shows how far we've come in terms of an 80-minute performance. Previously we've been good in patches but a bit up and down," said the former England Under-20 player.
"But we're starting to string 80-minute performances together and if you do that you're more than a match for any team in this league.
"We can beat anyone here if we turn up with that right mindset, that physicality and the will to go out and win and especially with this crowd behind us it makes a huge difference."