Problem with Basic HTML and HTML5 lessons

Tell us what’s happening:
Headline with the h2 Element
Hi. I don’t know why, but I cannot pass challenge, even though I did everything correctly, with every h1 and h2 things it still doesn’t work. Moreover, I have this problem not only in this task but in every task I try. Help me T.T

It looks like that

Your code so far

<h1>Hello World</h1>

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134.

Link to the challenge:

or that

I solved the problem, opened it in another browser lol