Green background appearing on Iphone (Safari and Chrome) for png images

I'm testing a website in production on Iphone and this morning the .png images of our team members started appearing with a green background (no css or anything applied). I am using Cloudinary CDN for image hosting and serving.

The original images don't have this background and show up correctly on every android device and desktop browser i have tested.

Here is a screenshot:

Do you have any ideia what is causing this.

Thanks in advance.