Since it’s a plugin you probably don’t want to edit it directly as then it will revert every time the plugin is updated. It looks like the problem is that the style has a float:left on it.
<div style="float:left; padding-top: 10px; padding-right: 10px; padding-bottom: 10px; padding-left: 10px; " class="interactive_left">
If you remove that float:left you get exactly what you want. Unfortunately for you the style is inline instead of part of a style sheet so I think your only option might be to find that bit of code in the plugin and edit it directly. You could ask the plugin author to move it to a stylesheet to make that easier but it’s really up to them.