What do you mean here since PhotoPost has nothing to do with your site's front page in any manner. In fact the only place we load a stylesheet we use in vb4 is the photopost.css file which has our css and that is only displayed in the gallery.
Your issue would have to be somewhere else I would logically think given how I know how our product works.
Your CMS has its own style class names in your vb
style. You definitely would need to give lots more information here for a more accurate answer.