By default password fields are not being saved by this plugin. Use this code example to exclude some fields from being captured as abandoned entries.

add_filter('frm_abandonment_exclude_field_types', 'frm_abandonment_exclude_field_types');
function frm_abandonment_exclude_field_types($excluded_fields){
    return array_merge($excluded_fields, array('number'));// This will exclude number field besides default password and credit_card fields.
}