High School Football Rules Question

I went to my high school's football tonight and it was a pretty good game. Two plays, however, left me scratching my head.

Both plays were basically the same. The running back broke off a long run that resulted in a touchdown. During the play, before the runner made it to the goal line, a blocker decleated a defensive player and on both plays an unnecessary roughness penalty was called. Instead of enforcing the penalty by bringing the ball back and nullifying the touchdown, the penalty was enforced on the kickoff.

I asked the referee at half time and he said it was a dead ball foul and even though the play had not ended and he stated this was a high school rule.

If this was college or the pro's, the touchdown would have been called back and the penalty would have been enforced from the spot of the foul. But not in high school? It seems like the offensive team is being rewarded for making a penalty.

Anybody know what is going on?