what do they all mean?

i keep getting yellow blocks with "999" which i presume is lag spikes?
i also have green bars and red bars/lines all the time
i have a 48 ping and dont "lag", but i constantly get stuck in walls and yesterday i got stuck underneath the floor for 5 seconds while i was being shot above ground and couldnt move
its damn frustrating being killed every 5 seconds because my view
" freezes", but everyone else just seems me moving around normally as i frantically bash space/pounce to try and get away
but any way, what do the colours mean?