Hello frederick
Kudos for creating the web book! Since I've had similar problems in the past, I believe the following will be helpful:
data on the home page (e.g., {1, número, enter}) is incorrect: Usually, placeholder formatting problems are the cause of this. Thee Program is probably expecting some data or input, but it's either not rendering correctly or it's missing. Verify those fields' settings again, as well as the data you entered. Regenerating the webBook after examining your data may resolve the issue occasionally.
Issue with the Individuals List: It appears that some people may have a small inconsistency in their names or other information that puts them in the incorrect area. I would see if there are any extra spaces or accents in the names that begin with "U" that would be interfering with the sorting. Furthermore, .Cheers!