Well it shouldn't since madden contracts are spread even for the duration of the term.
In the NFL, the guaranteed stuff is partially paid up front in the form of a signing bonus, and then roster bonuses are due each subsequent season, though that amount decreases each season, with the actually salary increasing each season. This way toward the end of the term, the player will carry a higher cap number in the form of actual salary, but it's easier for a team to cut a player in the last couple of years because that money isn't guaranteed. Dead cap space occurs when teams release a player, when they've already issued the signing bonus and commuted to a roster bonus for that particular season. This is why you might see guys like Romo, Brandon Marshall and Lesean McCoy cut before 3/10- their respective teams won't have to pay those roster bonuses.
It's confusing, I know.