Thanks for purchasing our product and really sorry for the size issue. This is a very common issue that happens sometimes when theme CSS overwrites our badge size and some other CSS property.
Please add the CSS code below to your website using the Customizer -> CSS option and it should fix your problem. You can change the 50px to your desired size to adjust the badge size.
.woocommerce ul.products li.product a img.badge_thumb {
width: 50px;
height: auto;
display: inline-block;
}
Please feel free to let us know if this solves your problem.
Thanks,
Robin