The controversial incident arrived with the game goalless in the 70th minute Stevens met Nicky Cadden's corner and glanced a header goalwards.
Cobblers goalkeeper Liam Roberts appeared to have kept it out, as video footage later showed, but Stevens and his team-mates ran off celebrating and the linesman awarded the goal, deeming the ball had crossed the line.
"I thought the ball was over the line so I ran off celebrating but then I stopped and wasn't sure if he was going to give it," said Stevens.
"The referee did give it so I ran off and celebrated in front of the fans and then I saw the ref went over to speak to the linesman but I don't know what that was about.
"From my view it went over the line and from the ref's view it went over the line so I can only go off that.
"I haven't seen the video back yet but either way I'll take it."
However, thankfully for Northampton - and the officials - that moment did not prove the different as Mitch Pinnock equalised deep into stoppage-time.
"It's frustrating," admitted Stevens. "I just want to get back out there on Tuesday and go and get three points because it was a horrible one.
"It was good in a way to come back and get myself a goal after having COVID because I didn't want to leave it too long until before I got back on the score sheet.
"I thought we defended really well and I could only see three points. The boys put their bodies on the line and I felt we had the better chances.
"I had such bad anxiety on the bench - I actually wanted to go inside and wait for the game to finish! It was just frustrating to concede with 10 seconds left.
"To come away to a team like Northampton, who are third in the league, it is frustrating not to get three points but a point is not a bad result either."