Can someone please give me some insight on what is happending here.

My product listing images are coming up small H:75 W:56, i have it set for w:160 H:300. Now why is it coming the small size which would be the size for the additional images on the product info page. But when i change the size it also changes the size for the small additional images on the product info page which intern is to big.

How do i go about changing things so that the images on the product listing page is set to the right height and width without affecting the other images, meaning the small images on the product info page?

They seem to work together.