I tested answers, same results. In fact, there is no problem with my code or answers, let's see how it solved.

The structure of MyList component is as follow:

return (
  ...
  // the problem is one of style classes of my <p>
  <p className="c3 c4">
    // components contains some <span className="c1 c2">...</span>
    {components}
  </p>
  ...
)

And the c4 class is exactly:

.c4 {
  float: right;
}

I don't know how but when i remove this class from <p> it works fine.

The problem solved, and thanks for all the replies.