This query relates to the information entered in the class details area of the census. To check and amend this go to Admin > Census > Spring > Class Details. In this area you are looking at the details for classes that show at the top of the page.
It is expected that you have class details added for each year group between the lowest and highest year group recorded in Admin > Config > Core Setup > School.
If this information is not correct you can click edit above the table, amend this and click update at the bottom to save.
If you need to edit the year group for a class recorded in Admin > Census > Spring > Class Details click the little pencil in the actions column at the end of the class you need to edit.
Once you have updated the class details ensure to click the little tick in the action to save: