FB Messenger App Problem

Hi All.. I have the most annoying issue on my phone at the moment.. So i use facebook messenger for just FB messages but it shoes two unread messages on the icon in a bubble.. hope you get what i mean, anyhow i have read all my messages tried clearing cache, tried clearing data and uninstall then reinstall... still shows two unread messages... funny thing is i clear all and uninstall and before i even login to the app straight after reinstall it already shows two unread messages! any help be great! thank you so much!