Redshirts

In assigning redshirts, I'm running across several players without redshirt button. Release is the only option. A couple I've seen this morning are true freshmen but can't redshirt. It's also not an issue with position minimums. Are there cases IRL where players can't be redshirted?
EDIT-this may be more of a game issue. I just realized that the assign RS period was at the end of the season. After going past RS, advance to new season was the next option. Setting redshirts is only done shortly after "start new season", correct? If so, I don't know how the sequence got screwed up. This is season 3 I've played in this particular save. I'll make a ticket and send file.
EDIT 2-Support won't allow me to attach .bin file due to size. Tried compressing but that didn't help. Any ideas?
EDIT-this may be more of a game issue. I just realized that the assign RS period was at the end of the season. After going past RS, advance to new season was the next option. Setting redshirts is only done shortly after "start new season", correct? If so, I don't know how the sequence got screwed up. This is season 3 I've played in this particular save. I'll make a ticket and send file.
EDIT 2-Support won't allow me to attach .bin file due to size. Tried compressing but that didn't help. Any ideas?