It's because of service time (or lack thereof) for the guys in the roster. The downside of a lot of created rosters is that when you create guys, they have no historical stats, so they are identified as rookies. Unless you go through a very painful process of simulating seasons, exporting the player, and then adding to a roster, this is going to be here.
It's just a byproduct of the roster creation process and does not harm anything. Just more of an aesthetic thing that will eventually iron itself out over the course of your franchise.

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