Cannot delete or edit some Contacts in iCloud.
I am having problems with an iPhone 5c administered via a Windows 10 PC.
The Contacts on the iPhone are synchronised with iCloud and any changes to most of them are reflected on both devices.
However iCloud shows six additional contacts, which appear to be duplicates containing old information, but are not shown on the iPhone. These additional contacts cannot be deleted or edited. If I try to delete them they return a short while later. If I try to edit them I get a message stating;
Couldn't save changes to 'Contacts Name'. Your changes to this contact couldn't be saved because it was just updated by another device.
None of those Contacts show on the iPhone and no other device is synchronised with iCloud. All of the Contacts shown on the iPhone can be edited or deleted and changes are reflected on iCloud. I have no Groups set up on either the iPhone or iCloud just All Contacts.
It is just the additional six Contacts only on iCloud that cannot be deleted or edited. How can I get rid of them?