CSS Class Conflict

This CSS class bug has had me tearing myself apart trying to narrow it down since yesterday.

There seems to be a CSS class bug that affects tables. Any table row that contains the class 'content' has its child <th> and <td> elements pushed one column over to the right (at least in the ltr context). Example code and image are presented below.

Tested with different themes. Only happens with GP, with and without GPP, with and without any other plugins, with and without CSS resets.

Tested with Opera and Firefox.

I suspect a jQuery script or regex on the_content() in GP is doing something funky with CSS classes of the form class="(.+)?content(.+)?"

Table

<table>
<tbody>
<tr>
<th>TH 1</th>
<th>TH 2</th>
<th>TH 3</th>
<th>TH 4</th>
</tr>

<tr class="">
<td>TD 1 with parent tr class=""</td>
<td>TD 2</td>
<td>TD 3</td>
<td>TD 4</td>
</tr>

<tr class="content">
<td>TD 1 with parent tr class="content"</td>
<td>TD 2</td>
<td>TD 3</td>
<td>TD 4</td>
</tr>

<tr class="row-content">
<td>TD 1 with parent tr class="row-content"</td>
<td>TD 2</td>
<td>TD 3</td>
<td>TD 4</td>
</tr>

<tr class="content-row">
<td>TD 1 with parent tr class="contentrow"</td>
<td>TD 2</td>
<td>TD 3</td>
<td>TD 4</td>
</tr>

<tr class="something">
<td>TD 1 with parent tr class="something"</td>
<td>TD 2</td>
<td>TD 3</td>
<td>TD 4</td>
</tr>

</tbody>
</table>

Result

Image URL: https://pasteboard.co/Hcfpep9.png