Strange behavior with figure/code/pre blocks (liquid)

[jmrplens]

I use this plugin to render the HTML generated with Jekyll.
When I have a code snippet and I normalize it with htmlbeautifier, it ends up having a bad format (visually). The code snippet in liquid is:

{% highlight c++ linenos %}

int main(int argc, char const \*argv[])
{
    string myString;

    cout << "input a string: ";
    getline(cin, myString);
    int length = myString.length();

    char charArray = new char * [length];

    charArray = myString;
    for(int i = 0; i < length; ++i){
        cout << charArray[i] << " ";
    }

    return 0;
}

{% endhighlight %}

When I don't use the plugin the output is:

<figure class="highlight"><pre><code class="language-c--" data-lang="c++"><table class="rouge-table"><tbody><tr>
<td class="gutter gl"><pre class="lineno">1
2
3
4
5
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17
</pre></td>
<td class="code"><pre><span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="err">\</span><span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
    <span class="n">string</span> <span class="n">myString</span><span class="p">;</span>

    <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"input a string: "</span><span class="p">;</span>
    <span class="n">getline</span><span class="p">(</span><span class="n">cin</span><span class="p">,</span> <span class="n">myString</span><span class="p">);</span>
    <span class="kt">int</span> <span class="n">length</span> <span class="o">=</span> <span class="n">myString</span><span class="p">.</span><span class="n">length</span><span class="p">();</span>

    <span class="kt">char</span> <span class="n">charArray</span> <span class="o">=</span> <span class="k">new</span> <span class="kt">char</span> <span class="o">*</span> <span class="p">[</span><span class="n">length</span><span class="p">];</span>

    <span class="n">charArray</span> <span class="o">=</span> <span class="n">myString</span><span class="p">;</span>
    <span class="k">for</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">length</span><span class="p">;</span> <span class="o">++</span><span class="n">i</span><span class="p">){</span>
        <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">charArray</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">&lt;&lt;</span> <span class="s">" "</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre></td>
</tr></tbody></table></code></pre></figure>

Visual preview (without htmlbeautifier):

With htmlbeautifier the output is:

<figure class="highlight">
          <pre><code class="language-c--" data-lang="c++"><table class="rouge-table">
<tbody>
<tr>
<td class="gutter gl">
<pre class="lineno">1
2
3
4
5
6
7
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12
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15
16
17
</pre>
        </td>
        <td class="code">
          <pre><span class="kt">int</span> <span class="nf">main</span><span class="p">(</span><span class="kt">int</span> <span class="n">argc</span><span class="p">,</span> <span class="kt">char</span> <span class="k">const</span> <span class="err">\</span><span class="o">*</span><span class="n">argv</span><span class="p">[])</span>
<span class="p">{</span>
    <span class="n">string</span> <span class="n">myString</span><span class="p">;</span>

    <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="s">"input a string: "</span><span class="p">;</span>
    <span class="n">getline</span><span class="p">(</span><span class="n">cin</span><span class="p">,</span> <span class="n">myString</span><span class="p">);</span>
    <span class="kt">int</span> <span class="n">length</span> <span class="o">=</span> <span class="n">myString</span><span class="p">.</span><span class="n">length</span><span class="p">();</span>

    <span class="kt">char</span> <span class="n">charArray</span> <span class="o">=</span> <span class="k">new</span> <span class="kt">char</span> <span class="o">*</span> <span class="p">[</span><span class="n">length</span><span class="p">];</span>

    <span class="n">charArray</span> <span class="o">=</span> <span class="n">myString</span><span class="p">;</span>
    <span class="k">for</span><span class="p">(</span><span class="kt">int</span> <span class="n">i</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span> <span class="n">i</span> <span class="o">&lt;</span> <span class="n">length</span><span class="p">;</span> <span class="o">++</span><span class="n">i</span><span class="p">){</span>
        <span class="n">cout</span> <span class="o">&lt;&lt;</span> <span class="n">charArray</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="o">&lt;&lt;</span> <span class="s">" "</span><span class="p">;</span>
    <span class="p">}</span>

    <span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
<span class="p">}</span>
</pre>
        </td>
      </tr>
    </tbody>
  </table>
</code></pre>
</figure>

Visual preview (with htmlbeautifier):

I still can't find where the problem is generated. Any idea?
I had thought of filtering the figure block so that it is not processed, but I don't see how to do it.
Thanks