Some images not showing on iOS devices

Four images (out of 42) are not showing in my form if viewed in iOS devices. I tried it in 3 iPhones and 1 iPad Mini. But they're all showing in Android and Desktop. What could be the reason?

Here's the link to my form:  https://form.jotform.com/201731525977460

Greetings and thank you for your message.

I have tested your form, and I was able to replicate the problem.

I have tried to rename the image, convert it, upload it elsewhere, use it in another form, however, the image is displaying as incorrectly loaded. 

Can you please try to find a different image you can use, and let us know if this resolves your problem?

Thank you for your understanding. 

Thank you Bojan for your kind support. It's probably because of the images themselves, though it's a mystery why the problem is with iOS devices only. I will just replace them.

Hi,

Thank you for reaching out to us.

If I remember correctly, there's a certain limit of resolution it can handle for GIFs and PNGs. For JPEGs, iOS had issues rendering JPEG 2000 files.

Do try replacing the images let us know if the problem persists.