They're both exchange contacts, nothing to do with Google. Very odd as I only have one exchange account.
I have now tried removing the account and reinstating it but I'm back to where I started.
As far as I can make out these all relate to the same account in Salesforce. Not sure if Salesforce is the issue though because Outlook is correct and reflects the up to date information.
I can click on the minus signs at the side of the source of this data as below. It seems that these contacts have become linked contacts - Android seems to think they are 2 records merged into one. I can unlink them, then it creates 2 separate contacts. I just have to delete the one with the wrong phone number then I'm sorted. However, I'd rather find out why this has happened then I can be sure it won't keep happening in future.
