Facebook constantly requiring 'Log In' or 'Join'

[Android Central Question]

Why on my mobile Facebook when l try to view my 'Pending Posts' and some other pages/quizzes etc does it require me to 'Join' or 'Log In'? I choose log in (as already signed in on FB) but when l type my password in, it just returns to join or log in again as if l hadn't just typed my password in! I can't view pending posts and its rather frustrating!. On a Samsung S7 (not the edge) and Android 7.0.
Tried the settings/app manager etc but its not working and l can't seem to uninstall it either.

 

[B. Diddy]

Welcome to Android Central! When you say you tried the Settings>App Manager​, do you mean you already tried clearing the cache/data for the Facebook app?