Bugs in the app

The app has bugs since few months. I have three iPhones with Facebook app. Facebook works just fine on the first iPhone.
In the second and third Iphone there are bugs. In one Iphone , the friend request tab is missing in the bottom. In the other Iphone , the messenger(messages) tab is missing. I tried un-installing the apps several times.

rrijal about Facebook, v85.0