Amazon A plus content images issue

I'm having trouble creating A plus content for a product listing. I've tried various modules and sizing but keep running into the same issue of a white/empty space in between images.

As you can see, these two images are designed to link seemlessly. And the plan is to have all 7 modules linked like this. 

What's bizarre is I've seen it done on other listings such as on the Herd Mentality board game. But lots of others. And I've even downloaded those images to check they are each separate, and they are. 

Any ideas what to do? Is there a particular module I'm supposed to use? Or export setting from Photoshop?