Issues recently

Recently (not sure if had update and it started) I notice when checking my emails I can delete an email then in a few seconds sometimes it shows back up in my inbox again. I also notice when checking my emails and deleting some I will be up to lets say 4PM messages received, then all of a sudden an email with a earlier time like 9am pops up that was not there before??? Strange things lately. Anyone else having similar instances or know of fix???