Galaxy A3 2016 black crush in dark areas

[AC Question]

i bought yesterday a new galaxy a3 2016 because my iphone 6 became slow af.
all works fine, except one thing that idk if its normal because its an amoled display or because the phone has some hardware problem.
When i use youtube or any videos on the phone while im in darker areas i can see black boxes around the video making it very annoying to watch, and in twitter nocturne mode the boxes of the user pictures bleed some kind of black color when i scroll down or up.
is this normal?

 

[chanchan05]

I'm not sure I understand what you're saying. I just opened Twitter and don't notice anything similar to what you're saying.