Image not centering

Hi,

You currently have HikaShop Business 3.5.0 as far as I can see.
The issue you have is not an image centering issue.
The issue is that you configured the products listing to have thumbnails with a width of 255 pixels and 4 columns but you only have a total width available of 700 px for the products listing due to the way your template is done and the left sidebar with modules in it.
And as you can see 4*255px is greater than 700px. So the listing doesn't have enough width for each image and thus it can only display a piece of the image while the rest of the image is "under" the next product tile.
You should reduce a bit the size of the thumbnails so that 4 of them can fit in 700px, or reduce the number of columns, or remove the sidebar on that page, or a mix of these solutions.