It is not uncommon that some errors creep into verbal traditions over a period of time. This has been the case with Sirhind which has been referred to as Suba or province in verbal traditions but was Sarkar or Chakla. It is never too late to correct an error.
The concept of dasvandh was implicit in Guru Nanak's own line: "ghali khai kichhu hathh dei, Nänak rahu pachhäṇahi sei"