Lynda,
As each followup is queued to ListMail the users position in sequence is incremented.
If the message seq # is 2, all of those users will now be set to receive message #3 next dailymail (or after message 3's delay value is satisfied).
Therefore, you could run a custom MySQL query to update all users on message 3 back to 2 for that list.
Assuming list is "1", the query would be:
UPDATE lm_users SET cseq = '2', cdel = '0' WHERE list = '1' AND cseq = '3';
This query can be run within PhpMyAdmin, commonly available from within your web hosting control panel. Load phpMyAdmin, click the database, click "SQL" at the top of the page, then paste the query, modifying it to match your list and sequence numbers.
Regards