Mail duplicating email address on reply

muncyweb

Registered
Quite often recently when I reply to an email in OS X Mail, the address of the sender gets duplicated or repeated in the "to" field of the email message. The sender's email is grouped within the same colored label. After just 3 emails to and from the sender, the sender's email address now shows up three times within the to field of my new message. What's up here? I came up with a fix -- add the sender to your address book and make sure that their name is associated with the email. It seems to fix the problem, but why does it do it in the first place?
 
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