Hello, Promoballons Belgium,
Thank you for contacting us and for using XStore.
1/ Please check the URL you provided, it is incorrect, so we can’t open your site, unfortunately.
2/ 3Ko ? Our theme doesn’t resize images, image settings come from WooCommerce https://xstore.helpscoutdocs.com/article/89-product-images , but they should not cause the problem.
It looks like an additional plugin on your site or custom code causes problem/conflict.
3/ In order to troubleshoot the issue you are experiencing, we suggest that you first try disabling all third-party plugins (including cache plugins) that are not bundled with XStore. You can refer to the following link for a list of included plugins: https://xstore.helpscoutdocs.com/article/36-included-plugins . Additionally, please clear the cache of your browser and check again. Let us know the result.
Kind Regards,
8theme team