Help

[oridrax]

I am a Little League ump... but I think the ruling I am seeking clarification on applies no matter what level of play. Here's the situation( by the way this was the game ending play... so please let me know if I blew it):
Baserunners on 2nd base and 3rd base. One out. Batter hits fly ball to left field. The left fielder catches the fly ball. The left fielder runs with the ball to 2nd base and tabs the base for the 3rd out before runner at 2nd base returns to the base( 2nd base runner did not properly tab up and was attempting to return to base). However before left fielder tabbed 2nd base for 3rd out the runner at 3rd base ( after properly tabbing up) touched home plate to score the apparent tying run. I ruled that since the 3rd out was a "force out" at 2nd base to end inning the run did not score.