Fulham were pushed closer to relegation after throwing away a two-goal lead in Saturday's 2-2 draw at Craven Cottage.
Asked whether nerves or naivety cost them, Stockdale said: "All of the above.
"When you are anxious to get the 90 minutes over and take the three points, things can go astray. There was a lot of tension in the ground and we did things that we would not normally do at home. That was our downfall.
"You could say we did not deserve to win because of the way we defended in the last 10 minutes. We should have closed the game out and made sure of three points."