If the number of followers/followings does not match, the list may contain users who have left ZEPETO. If your list contains any users who have left, the list will be automatically recovered after 7 days.
If someone who owns the list has more than 1000 followers, you can only search for 1000 users at the moment.
Please check if there are more than 1000 followers in the account that you are not able to search. But if the problem persists, please contact the Customer Support.