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NFLでは片方のチームが5ヤード罰、その相手チームが15ヤード罰を
犯した場合、15ヤード罰だけが適用される

14-5-1 DOUBLE FOUL WITHOUT CHANGE OF POSSESSION

Exceptions:
(1) If one or more fouls by one team includes a 15-yard penalty, and the
penalty for the foul or fouls committed by the other team is for a five-yard
penalty without an automatic First Down, a loss of down, or a 10-second
runoff (15 yards versus five yards), or that is not a spot foul, the 15-yard
penalty is enforced from the previous spot, and the five-yard penalty is
disregarded.

https://operations.nfl.com/the-rules/2019-nfl-rulebook/#article-1.-double-foul-without-change-of-possession