Why does my ZTE phone still show that I have messages when I don't

[AC Question]

On the screen of my phone in the messaging section it shows that I have 3 messages. I deleted all messges but it still shows that there's 3 messages available. Can someone help please?

 

[B. Diddy]

Welcome to Android Central! Are you talking about text messages or email? And do you mean the unread badges on the app icons?