Default Stock email app sometimes give me a double notification?

So I have a hotmail address setup in the stock email app and when I go to the email via the notificaiton in the drop down bar when it brings me to the email in the email app I get a second notification sound and then the email stays open like it is new after I exit from the email.

Hope that wasn't confusing.

Receive email notification > Pull down notification menu and click on the email > Brought to that email > Immediately I hear a notification sound and I see that exact same email come across on the notification panel > Exit email and go to email app and that same email that I was just in is showing as new and not read.

Phew, sorry for that, wasn't sure how to explain. This doesn't happen every time but it is happening a lot to me, stock rooted and on the latest OTA.

Thanks
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Nexus 5 - 32GB Black - Unlocked & Rooted
TWRP
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S4 - White (Wifey's)
Philz | MK2 ROM | MF9 Bootloader
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