Cursor hand only appearing on small part of linked image

Until now when hovering over images on the http://www.oldmapsandprints.com.au site cursors have always changed to a hand over the whole image.

Just in the last couple of days this has changed so that on http://www.oldmapsandprints.com.au/bs-gallery/topography-2/topography-australia/sydney-3-2/ for example when placing the cursor over any of the images it only changes to a hand on a very small part of the image.

Has anyone come across this before? I am at a loss. I have deactivated all the plugins and that hasn’t changed it.

Also the cursor is behaving normally for images inserted earlier.

Any help would be so much appreciated!