Outlook 2011 Showing Read Emails if my iPhone has checked them

Using Outlook 2011 on my MacBook Pro.  Up until my vacation last week everything was working mostly fine.

I have my Outlook set up as an IMAP email and my iPhone set up as POP Account for the same email.  Generally, when I check my emails on my phone nothing corresponds with my outlook which is fine.  When I came back from vacation all the emails in outlook were showing as read, even though I hadn't read them, even on my phone, although I had checked them on my phone and read a couple.  

Now it seems if I'm away from my desk and I just check my email on my phone, when I come back and look at my outlook all the messages that came in show as read.

Please help!