Red underscore appearing when using custom HTML

When using custom HMTL output, I encountered a problem whereby a red underscore appeared between each image.

This occurred because the whitespace was being underlined for some reason.

Rather than create a new CSS class etc. I removed the style directly on the a tag.

For reference the full loop code I used is below. This was done to enable Google Analytics click tracking.

<p>
{$stickers_start}<a href="{$sticker_url}" onClick="_gaq.push(['_trackEvent', 'SocialButton', 'Click', '{$sticker_name}']);" target="_blank" title="{$sticker_name}" style="text-decoration:none;">{$sticker_img_64}</a>{$stickers_end}
</p>

http://ww.wp.xz.cn/plugins/social-stickers/