On the very next play, Curtis Martin scored on a 6-yard run.
The Jets wouldn't score another touchdown the rest of the night.
The second fumble came as the Dolphins were driving toward a touchdown on their first drive of the second half. Ricky Williams coughed up the ball inside the Jets 2-yard line and instant replay upheld the call after the Dolphins challenged the ruling on the field that Williams fumbled before his knee hit the ground.
The Dolphins also lost another touchdown when the Jets successfully challenged the ruling that Chris Chambers had come down with a Lucas pass in the corner of the end zone in the second quarter.
Replays seemed to indicate that Chambers made the catch in bounds, but the official announced that there was no catch because the ball rolled away from Chambers as he landed out of bounds after getting both feet in.
The call didn't seem to make sense, but that's the way things are going for the Dolphins these days.
After the dubious overrule, the Dolphins had to settle for a field goal — a four-point swing.
The Dolphins did reach the end zone in the third quarter when Lucas connected with fullback Rob Konrad on a touchdown pass that tied the game at 10-10.
But the offense also failed to get any points after that despite reaching Jets territory on each of its final three drives.
The last one ended the game after John Hall's field goal with 2:17 left gave the Jets a 13-10 lead.
The last drive started very well, with Lucas hitting Robert Edwards for 10 yards, Dedric Ward for 11 and Edwards again for 7.
That gave the Dolphins a second-and-3 at the Jets 38-yard line. But Lucas made a crucial mistake on the next play when he failed to see cornerback Ray Mickens quickly enough and wound up taking a 9-yard loss on a sack.
Two incompletions followed, ending the Dolphins' chances.
The defense played very well for most of the night, but did not force any turnovers and gave up one big play, which proved very costly.
That play gave the Jets a first down at the Miami 48-yard line and set up Hall's game-winning field goal.
With the loss, the Dolphins drop to 5-4 and are now tied with Buffalo and New England atop the AFC East, with the Jets only a game behind at 4-5.
For the Dolphins, though, the bigger concern is finding a way to stop this slide.