Outlook 2013 - Messages get marked unread after reply (only when clicking the alert to open a message)

I am experiencing a mildly infuriating issue with Outlook 2013. When I receive an email, if I click the alert box that pops up to open the email and reply to it from that window, the message gets marked unread when I actually send the reply. It is driving me crazy.

I think it has to do with the "Mark Unread" button. When I click the alert box, that button is already "on". I don't know why that would be.

See attached screenshot.
street9009IT Project ManagerAsked:
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AmitIT ArchitectCommented:
Can you check from another PC or machine. If you see same issue. If not, reinstall Office or outlook again.
street9009IT Project ManagerAuthor Commented:
I don't have Outlook 2013 on any other PCs currently. But I do have 2010 on another and I tested there and it does not have that problem.

Is a reinstall the only fix?
AmitIT ArchitectCommented:
If it working fine on 2010, that rules out server here. You reinstall  Outlook 2013 or complete Office 2013 and install it fresh again.

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Sudeep SharmaTechnical DesignerCommented:
Did you tried re-indexing the system? Also make sure that Outlook is included in the Indexing search option.

street9009IT Project ManagerAuthor Commented:
Uninstall and reinstall fixed it.
street9009IT Project ManagerAuthor Commented:
And just like that, it's already happening again. Would Microsoft Lync (Skype for Business) have anything to do with this? I'm doing the Windows updates now after re-installing Lync (I had to uninstall it to get Office to reinstall).
AmitIT ArchitectCommented:
You have some other tool or software, like handheld device with Active Sync. You might need to look, where all you configured the profile.
street9009IT Project ManagerAuthor Commented:
Sorry, not sure what you mean.
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