[Koha] [koha] Crtitucal- Barcodes not saving.

Hi all, We have been editing our items and replacing the barcode field with a new one. It has been working well until the last four days that the new barcode is not saving. After saving the old number is still showing instead of the new one. What could have happened?  Please assist. Warm regardsJames Sent from my Samsung Galaxy smartphone.