Congress passed a law on April 16, 1862, which required twelve month volunteers to reenlist. The standard term for recruits was revised to three years or the war. Those who had already served twelve months were given credit for one year served. Perhaps that will help explain what you see on the cards.
To get some idea of what maight have happened, you'll need some idea about the availability of other rolls after the July/August roll for 1862. If there were no later rolls, you'll have to based any guesses about what might have become of the man on his pension application. If tere were later rolls, this man was taken off for one reason or another after the earlier roll but before the later one.
Doesn't the pension application say what became of this man?