Why are some of my emails, which I have transferred to some storage folders being overwritten by an earlier email?

,

It only occurs in one or two storage folders, The subject title remains as before it was transferred to folder and If the transferred email had an attachment, this still shows with the subject heading  but when I open it to read the email, the content is the same as another email lower in the folder and the attachment isn't available. This is happening to almost all of the emails in the particular storage folder.

Can anyone help?

Product info:

Version 2012 (Build 16.4.3528.0331)
Copyright © 2012 Microsoft Corporation. All rights reserved.