Problem managing multiple pop accounts under one view

Problem managing multiple pop accounts under one view

 I currently am managing multiple pop email accounts under my main view of tzone345 @ zoho.

90% of the time everything works fine and incoming emails are inserted into the correct pop email account

correctly for replying and managing.   However, about 10% of the time i receive some emails from

bill @ logicalworkspaces under my bill @ thetravelzone email view and this causes a major issue for my business.  When

an incoming email is inserted into the wrong account i cant reply with the correct email "From" address.

Please advise on what the issue may be and how to correct this ASAP.