Automatic generation of the header does not work

Good day.

I use the automatic generation of the header of material.

Header template was: “№ [node:field_serial_n] by [node:changed]
I changed it to: “№ [node:field_serial_n] by [node:created]
Save it, clear cache, even used “update.php” but the title of material created previously has not changed.

Help, please.

Drupal version: 


Source: https://www.drupal.org/taxonomy/term/22/feed