Picture in cart

Hello,

I have a problem with pictures in the busket. Some of them are displayed normally, but some are completely invisible even if they are placed at the same position as the others and some are displayed with an image from the gallery of the product instead of a thumbnail image.Please, look at “screen” where is possible to see that there is no image in the red circle but in the green one the picture from the gallery is present

Picture: http://vsepropejska.cz/wp-content/uploads/2015/07/kosik.jpg

WEB: vsepropejska.cz

https://wordpress.org/plugins/woocommerce/