Offside on kick-off, NFL/NAFL rules

[wwcfoa43]

Some of our guys are going to be working our second NAFL soon and so we are studying the NFL/NAFL rules.

Situation (NFL/NAFL rules): The kicking team is offside on the kick-off. The ball is caught and returned to the receiving team's 30 yard line.

Ruling?

The reason I ask is because I was watching the Bills/Steelers game last night and this rare situation happened and the officials enforced from succeeding spot (where the ball was dead) instead of from the previous spot. In the NAFL rule book, my reading of this puts the enforcement at this at the previous spot.

So either the crew made a mistake, the NAFL and NFL rules differ on this or I have missed something in the NAFL rulebook?