I am noticing an odd behavior while reading and deleting email on the notifications screen. I swipe to quickly glance through an email and then go at the end to "Delete" or "Mark as Read". When I press Delete this email is deleted but all the other ones shown for previews in the notifications center all disappear from notifications. I then have to go into the Mail app and deal with each new email singly. I am pretty sure this is now how it used to work and deleting one email would let the others still be in the notifications center. What is happening?