css parse error

Hello, when using WCPS i get various CSS parse errors, e.g. due to an empty font-size and errorneous background:url

<div class=”wcps-items-price” style=”color:#626262;font-size:”>

<div class=”wcps-ribbon wcps-ribbon-none” style=”background:url(https://kofferteria.de/shop/wp-conte…erce-products-slider/assets/front/images/ribbons/none.png) no-repeat scroll 0 0 rgba(0, 0, 0, 0);)”>

You can verify this via https://validator.w3.org/nu/?doc=https%3A%2F%2Fkofferteria.de%2Fshop%2F%3Fcheck