Access 2002 Reports

In Access 2002 SP3 Reports there was a saved Report entitled Mailing Lists. I wanted to update the categories we have and so opened it in Design View. Here under the ID Header we have Surname, First Name and then a list of the various groups/categories to which people are signed up.

I wanted to delete one of these categories and alphabetically insert another one. So I clicked in the individual box, deleted the wording and overwrote it shifting each of the categoris to the left ending up with the relevant space to insert the new category. Now however it looks like this report is still drawing and assigning the original information to the 'old'/deleted category (although it has a new and thus incorrect name).

I have noticed that in the unchanged categories these seem to have an object assigned e.g. Do Not Mail_Label. How can I attach the relevant object to the newly named categories and get it to draw the correct information from the database?