Hi menaledezma,
The issue has been fixed and deployed on our web site.
Please download the theme package again and update the theme as described here.
If you don't want to update the whole theme you can replace only these files:
Themes/ArtFactory/Content/css/styles.css
Themes/ArtFactory/Content/css/styles.rtl.css
Themes/ArtFactory/Views/Product/ProductTemplate.Grouped.cshtml
Themes/ArtFactory/Views/Product/ProductTemplate.Simple.cshtml
Thanks