What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
It's either the images are blocked (by their firewall or antivirus or country filtering like China) or it's a glitch in the form. Ask them to check their browser console for logs.
1. While viewing the form, press F12 on the keyboard to open the developers tool.
2. In the developers tool, find and click the "Console" tab. The logs are in the console area, red texts are errors.
I checked your last form ID and can only find images that are related to the form backgrounds. Are these the images that you are referring to?