Galaxy Note 2014 deleted emails come back. If I delete them using my computer they stay away but if I delete using the tablet they keep coming back. What's wrong?
Are you sure the tablet's connected? Try logging out of your account and re-logging in (this will force a sync). Also check whether your tablet is set to Delete or Archive when you hit the trash icon or swipe left on the message.
PS: Sometimes it can take a minute for the change to be reflected on your other GMail clients.