on the /terrier/admin/registers/update_registers_record.php page, I see 2 problems:
1) The recordset that is used to populate the form does not have a filter set. it should be set to filter the re_index column using the re_index URL Variable.
2) In the Update record behavior, you are using the recordset bidding for each column. Instead, you should be using the form bindings.
the idea behind an update page is this:
The link to an update page will pass the ID of the record to update as a URL variable. Use that URL variable to filter a recordset and return the record to be updated.
create the update form, and set each element to use the corresponding column form the recordset.
When the form is submitted send the form data to the update record behavior so that any changes made in the form can be saved to the database.