Thumbnail image is not smaller then product image

-- url of the page with the problem -- : www.aquaria-shop.nl/LED-Verlichting/product/warm-white.html
-- HikaShop version -- : 2.3.0
-- Joomla version -- : 3.2.3
-- PHP version -- : 5.3.3-7+squeeze19
-- Browser(s) name and version -- : chrome 33.0.1750.146
-- Error-message(debug-mod must be tuned on) -- : Error_message

I have changed image settings of thumbnail images to 100 px
And the product images to 400 px
But the thumbnail images are not smaller.
Can you help me?

It's your JCE Mediabox zoom stuff which messes with the CSS of HikaShop and that's why the small thumbnails display like the main image.

Add such CSS on your website and it will display properly:
img.hikashop_child_image {
height: 100px !important;
width: auto !important;
}

www.hikashop.com/support/support/documen...ize-the-display.html