My headphones mic isn't working

I got really cool looking red headphones and they have those microphones in it.

So I plugged them in and so far the hearing part was great. (ya know, hearing youtube videos)
But when I went to test a microphone. It sound really distorted and nothing like my voice. It sounded really loud and sounds like a moving robot. I also have nothing around me that makes this sound. I don't know if it's my headphones or just some websites it's not working..

I tested the sound on
scratch.mit.edu

Could I be wrong or is that the website?
I also was stressing about this and it just made me angry.