Woocommerce Single Product Thumbnails broken

Hi guys

Ive just updated to woocommerce 3.0+ and since doing this the thumbnails below the main product image are being blown up to a big resolution and running down the page rather than being thumbnails under the main image see here > https://dreamyprincess.com.au/shop/kids-clothes/boys-t-shirts/leisure-play-suit/ and screen shot attached ive tried regenerating thumbs and following a few other threads but can’t find a fix.

Thank you