Normal
My experience (26 cruises) is that it is much easier to change from late seating to early seating than it is from early seating to late seating. Your travel agent should be able to do this if it is more than 4 weeks before the cruise. After that the papers are done and it still could be changed, but you would not have confirmation of the change. It would be good for you TA to request the change anyhow. ( You confirm as soon as you board) Why were you initially scheduled for late seating? (We have always had the early seating. It is the time of day that I usually eat regularly.) . Again, I would feel confident that there are more people at early seating trying to get to late seating than the other way.