Messed up html tags on product page

Hi,
I have some issues with your plugin on my product page. I looked into the html and found some messed up tags. Here is what is in my html:

<div id=”product-18759″ <span=”” style=”display:none;” class=”abc-hook abc-hook-action “>
-> div tag does not close with “>”, the span is not closed by </span>, so this element wraps the whole product content

Later, there is some class text (without any wrapper, span whatsoever):

class=”rtwpvg-product product type-product post-18759 status-publish first outofstock product_cat-dachzelt-kauf product_cat-dachzelt-kauf-maggiolina has-post-thumbnail taxable shipping-taxable product-type-variable”>

When I fix these issues, the page is not messed up anymore. I can give you the whole html if it helps.
I see the potential of this plugin, so it would be great if you could fix this!
Thanks in advance!

Best regards,
Christoph