Please post a link to an example.

When an image is centred, it is done so by making it a block element, and adding a margin value of "auto" using inline css styles. The "margin:auto" style will then create a margin on the left and right of the image big enough to center the image. As the link tag wraps the image, it then inherits the total size of the image, including the margin, and so the active, or click area of the link is set as this total size.

An alternative is to apply the Align center to the paragraph the image is in, rather than the image itself. This will align without using a margin.