The “spring game” in college football isn’t actually a game. It’s one of the 15 practices the NCAA allows schools to have. At best, it’s a scrimmage, and not a particularly representative one, given that the squads are split up. In the other scrimmages teams have, which are typically closed to the public, it’s offense v. defense, with players getting to rep with the first string, not a mish-mash of first- and second-team units. The spring game is the least important of the 15 spring practices.
This applies to all college teams, not just Florida State, which had about as good a spring game experience as could be asked for.