Every time I delete an email a old email loads in place

Hi, I have Comcast and use Outlook on my computer.
My email sync perfectly and I have my setting on my phone to never delete my email. I have it set for 50 email to show.
My problem occurs when I want to delete an email on my phone's inbox but when I do that a old already read email loads on my phone as a non read email.
It loads that email in the oldest position(bottom) of my emails
Anyone know how to make this stop happening?
Thanks in advance

I had to go into Outlook on the PC and delete them. Sucks.

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