When I hit “reply” the e-mail goes to myself and not the intended recipient

I have a couple different e-mail addresses tied in to my hotmail account.  Let's pretend they are *** Email address is removed for privacy *** and *** Email address is removed for privacy ***.  When I hit "reply" to messages sent from *** Email address is removed for privacy *** to *** Email address is removed for privacy ***, the message goes to "myself" instead of to "office."  These messages need to go to *** Email address is removed for privacy *** so that my assistant can see them.  Can you tell me what's causing this problem and how I can solve it?  Thanks.