Unusual behaviour of multiple outgoing emails

I am currently using outlook 2013 for sending and receiving emails.

I have seen an unusual behavior on sending emails.
Whenever I sent email(s) but at the bottom of the screen, it seems sending more emails than what I was sending. I felt like hallucinating.
I see the same thing when I had used Outlook 2007.
That happens very often.

Just a few min ago, I sent one email to my children but I see that 5 emails were going out.
I could not find or identify 4 other emails. No trace of those emails on my computer. I have no idea what is going on.

Could someone explain to me why some emails were sending out without my knowledge?
I am sure that I am not under surveillance by PRISM.
I am nothing but a humble retired person.
(my OS is Windows 7).

Yes. Five email accounts are listed under Account Settings but I use mainly one email account.

I don't quite understand what "grouped" means.
All of my Contacts and email accounts are listed individually in Outlook 2013.
As described before, my 5 email accounts are listed individually in Outlook email account.
but there is only one email account (i.e.. the main email account) is listed under my name in Contacts.

Try to delete/remove your other emails temporary then try if it will work