title: React CSS is duplicated
body: <p>I have a problem where all of the CSS (style tags) output in my React app are duplicated.
  The picture below shows an example of the duplication. I have included a copy of my <code>webpack.config.js</code> file here: <a href="https://paste.ubuntu.com/p/mdv5Z9bB9v/" rel="nofollow noreferrer">https://paste.ubuntu.com/p/mdv5Z9bB9v/</a>. I have no idea what's causing this and would love some suggestions for ways to debug this.</p>
  
  <p>Please let me know if any other info is needed!</p>
  
  <p><a href="https://i.stack.imgur.com/ylvEJ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ylvEJ.png" alt="enter image description here"></a></p>