Power adapter weird behavior

Hi everybody,

My macbook pro not charging when I plugged in the original charger that come with my macbook. But when I test with a fake magsafe 2 charger, it worked. And then I test my original charger with another macbook pro 15”, it also worked. I did that test with several original and fake magsafe 2 chargers on my macbook pro, the fakes worked, but the originals didn't.

Please, if any one knows what happened with my macbook pro or my magsafe 2, please tell me. Should I buy a new original charger or a fake one?

Thank you!