Wolves boss Gary O'Neil admitted frustration after their 1-1 draw at Luton.
O'Neil concedes they struggled in the first-half.
"I was incredibly disappointed with the start," said the manager. "To lose so many duels is not acceptable. The lads are aware of that. That's the first time I've seen that.
"They delivered in the second half. We should have won the game.
"I can't get my head around the penalty. I have a lot of experience, I've suffered constant negative ones - I was told it wasn't a penalty last season in Bournemouth's game with Brentford last season on Jensen becuase it hit his leg and then his hand. I was convinced it wasn't going to be a penalty, it's never a penalty. If that's a penalty we're in a really bad place.
"The fact it hits his leg and bounces onto his arm is completely different.
On Jean-Ricner Bellegarde's red card, he added: "He understands. He's apologised to the group. We can't suffer lack of professionalism."