bugs and unexpected behaviour

[tempneq2000]

issue 1: 'fixed top bar' doesn't work
expected behaviour: top bar is fixed on top of the screen no matter what
actual outcome: top bar moves along scrolling down, only appearing when the feed page is at start

issue 2: bug in 'enable dark mode' built in the app
expected behaviour: background change into black or other dark colours and letters change into white or other light colours
actual outcome: letters change into white but background remains white

issue 3: bug in 'enable dark mode'' built in the app when the same setting built in Facebook is also turned on
expected behaviour: normal font display
actual outcome: some characters and icons turn into unidentifiable units

OS: Android 14 (LineageOS 21)
device: Motorola Edge 40 Pro (XT2301-5)