1 – Theme options > Woocommerce
2 – On page load, woo loads the single product image according to the size set in woo > settings > products > display: Single product image. Perhaps at one point you had that set to a different size and didnt regenerate the images after changing it? The reason it looks okay after clicking through the other thumbnails is because the jquery that changes doesn’t load the the image using the single product image size.
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