Responsive view problem

Hi,

It's not a bug.
You've configured a height of 200px for the thumbnails so that's the height that is reserved on the image area. But as your image ratio doesn't correspond to the ratio you have for the height/width of the thumbnails in the settings, you get a image which doesn't fill all the space and you're left with blank space below the thumbnails on the listing.

It has nothing to do with the number of columns you're using or whether you're using a responsive view or not. So we can't provide a hotfix or patch to that problem as that's not a problem.
It's doing what you told it to do. Reduce the height setting of the thumbnails to get the same ratio of the images, or add CSS to force the height of the area to be calculated automatically:
.hikashop_product_image, .hikashop_category_image {
height: auto !important;
}