Hi Daniel,

I see you are using W3 Total Cache on your site:

(view large version)

That may causes these issues to happen. Can you please clear the cache and any CSS optimization plugins cache.

Product category image

You can add this code in functions.php

function single_product_small_thumbnail_size_large() {
	return 'large';
}

add_filter( 'single_product_small_thumbnail_size', 'single_product_small_thumbnail_size_large' );

By default on product category, shop_catalog image is used, which can be configured on WooCommerce > Settings > Products > Display

Hi Daniel,

Do you mean space between category items and row?

Can you please add this Custom CSS:

.items .row > .products-category-entry:nth-child(2n + 1) {
    clear: left;
}