Is there a glitch in FCC's system?

I am not typing anything yet when i press submit it says pop up as if it is correct. I opened a random lesson, and the answer is already there. What do I do? I want to actually learn this stuff, and not see the answer.

Is it possible that you’re using a computer on which someone has already completed some of the FCC challenges?

Considering what @ArielLeslie said, try using a different browser. The solutions are saved locally. I would suggest clearing cache, but maybe the person who solved the challenges before you wouldn’t appreciate