Can Execution Date Of Power Of Attorney Be After Registration Date?

A power of attorney for sale of property was made by my parents to me since they are infirm and cannot travel. There was a typo in the POA and the execution date was made as 21st Oct though the registration was done on 21st September . The registration has been done and the stamped copy received after upload so it is not possible to correct it. Is there any issue if the registration is done before the date of execution? Is the POA valid ? And is there any way to correct this typo?