Multi-Browser Transparency Issues

I’m using Motion 1.0.7 by Sam @ 85ideas

The banners and any images I upload to the site have been saved as PNG-24 with transparent backgrounds in Photoshop.

The background which should be transparent … is showing through white.

Here is an example.
https://cutjapan.com/wordpress/?p=49

As you can see, the 3 image collage at the top is supposed to be on a transparent background but it is showing through white.

Does anyone know how to fix this issue so the background is showing transparent?

I tried a few things but couldn’t figure it out.

Images are currently hosted on Flickr … but I tired directly uploading them as well. No luck in either case.

Thanks.