Getting Person number already existed error during Rehire and Contact details update

Summary:

Dear Team,

During Rehire a terminated employee - though I gave Rehire date as after termination date only

And during My Client Groups -> Person Search -> RHS Person screen -> In Contacts tab -> If I edit Relationship Info, Personal Info, Phone and Address

In above both scenarios I'm getting the above error i.e. A person number with this value already exists. Enter a Unique Value (PER-1531466)

Could you let me know how to resolve this issue and how can I rehire an Employee and update Contact details.

Thanks & Regards,

Sri Vidya Allada

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