Why does the menu in the mobile version go to the second line?

Question

css

I’m trying to figure out the layout, I took bootstrap, I don’t understand why the menu goes to the second line in the mobile version?
Website - nikitakrim.com/video1.html Menu
code

<div class="row">
    <div class="offset-md-5 offsett-sm-0  offset-0 mb-5"></div>
<div class="col-md-1 col-sm-6 col-6 mb-5"> <a href="index.html"><p>porfoLio</p></a> </div>    <div class="col-md-1 col-sm-6 col-6 mb-5"> <a href="contacts.html"><p>contacTs</p> </a> </div>
<div class="offset-md-5 offset-sm-0 offset-0 mb-5"></div>
</div>

Answer 1

That is, the presence of a typo in the names of classes does not bother you at all?