could you please provide the entire reproducible code so I can try to replicate your issue? I tested the following code, and justify-between works as intended, so I’m unable to reproduce the problem.

import React, { Component } from 'react';
import { render } from 'react-dom';
import './style.css';

class App extends Component {
  constructor() {
    super();
    this.state = {
      name: 'React',
    };
  }

  render() {
    return (
      <>
        <nav className="w-full flex justify-between">
          <div>asdsad</div>
          <div>asdsad</div>
          <div>asdsad</div>
        </nav>
      </>
    );
  }
}

render(<App />, document.getElementById('root'));

Here on this image you can see the result: