Gmail Categories Indicates Email in Them When They Are Empty

[Skeezix]

When I tap Gmail > Menu, it sometime indicates there is email in some of the categories (Inbox, Sent, All mail, Spam, etc.) But when I tap one of the icons that is showing I have email in that category, it says Nothing in (category). Why is that?
(I'm up to date with my updates.)

 

[B. Diddy]

Have you already tried clearing the app cache for Gmail in Settings>Apps, then Force Stopping it, and then opening again?