Pressing "Back" button on browser messes up jquery.shorten

[Naokimi]

I'm on a page that uses jquery.shorten. The HTML in place is as follows:

<div class="listing__content" data-shorten="150">
  <div class="shortcontent">
    <p style="margin-bottom: 0px;">Pikachu is a main character in the Magical Pokémon Journey manga series. He is described as rather scatterbrained, doesn't speak human language, but t<span class="ellip">...</span></p>
  </div>
  <div class="allcontent" style="display: none;">
    <p>Pikachu is a main character in the Magical Pokémon Journey manga series. He is described as rather scatterbrained, doesn't speak human language, but the others seem to understand him.</p>
  </div>
  <span><a href="javascript://nop/" class="morelink">Show More</a></span>
</div>

I go to another page, then press "back" button my browser to return to the page with jquery.shorten and the HTML is messed up (concretely, it gets nested):

<div class="listing__content" data-shorten="150">
  <div class="shortcontent">
    <div class="shortcontent">
      <p style="margin-bottom: 0px;">Pikachu is a main character in the Magical Pokémon Journey manga series. He is described as rather scatterbrained, doesn't speak human language, but <span class="ellip">...</span></p>
    </div>
  </div>
  <div class="allcontent" style="display: none;">
    <div class="shortcontent">
      <p style="margin-bottom: 0px;">Pikachu is a main character in the Magical Pokémon Journey manga series. He is described as rather scatterbrained, doesn't speak human language, but t<span class="ellip">...</span></p>
    </div>
    <div class="allcontent" style="display: none;">
      <p>Pikachu is a main character in the Magical Pokémon Journey manga series. He is described as rather scatterbrained, doesn't speak human language, but the others seem to understand him.</p>
    </div>
    <span><a href="javascript://nop/" class="morelink">Show More</a></span>
  </div>
  <span><a href="javascript://nop/" class="morelink">Show More</a></span>
</div>

Repeating the steps above further nest the HTML