Format of email address

[Top Spin]

As I look at individual contacts, I notice that in the email field,
most of them have an actul email address, something like
(e-mail address removed).

But in a few of them, the email address field is the same as the name
field, but underlined.

For example, one of my contacts is "John Doe". His email address is
"(e-mail address removed)". If I open his contact record, the full name field
shows "John Doe". The email field shows "John Doe" (underlined).

If I double click on the email field, an "email properties" panel pops
up showing the actual email address ([email protected]).

1. Why is this different for just a few contacts?

2. How can I get all of them to show the actual email address?

Thanks