Double first name in name display

[Lincoln]

I have noticed a couple of contacts that display oddly in
one situation. When I open the full card for these
contacts, their name is displayed on the very top line of
the window as "[First name] [First name] [Last name]",
i.e. Bill Bill Jones.

For that contact, "Full name" is: Bill Jones.

"File as" is: Jones, Bill.

"First name" is: Bill.

"Middle name" is: blank (nothing in the field).

"Last name" is: Jones.

This does not occur for at least 95% of my contacts.

Any ideas how to correct that particular display of his
name?

Thanks.