Yup, it's from your template: in the file /templates/rt_voxel_responsive/css/typography.css it says
.typography-style-light span.email, .typography-style-light span.phone, .typography-style-light span.quote, .typography-style-light span.cart, .typography-style-light span.rss, .typography-style-light span.tags, .typography-style-light span.write, .typography-style-light span.info, .typography-style-light span.sound, .typography-style-light .email li, .typography-style-light .phone li, .typography-style-light .quote li, .typography-style-light .cart li, .typography-style-light .rss li, .typography-style-light .tags li, .typography-style-light .write li, .typography-style-light .info li, .typography-style-light .sound li {
background-image: url("../images/typography/light/icon-set1.png");
}
As a quick fix to not have an image there on product pages you may add the following CSS e.g. by following the tutorial in the link I gave you:
.hikashop_product_tags li {
background-image: none !important;
}
In case of other troubles in that regard please check with the template provider.