SPP shares issued as Issuer not HIN

I have just received two dividend statements for my holding in GC1.
On investigation, I discovered that the extra shares I received in the recent SPP were Issuer issued, rather than HIN, using the same number as on my main holding and which I used for my SPP application.
Why on earth was this done?
Now I, and presumably every other shareholder, has to go online and do a transfer to amalgamate the two holdings.
Whose incompetence was this? GC1 or Boardroom?
An apology is owed to shareholders.
Unbelievable!