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I checked your form, cloned it and view it on my Android device, and this is how it looks like:
If you want the image header to be mobile responsive, please follow this guide: https://www.jotform.com/help/311-How-to-make-Forms-Mobile-Responsive
After applying those changes, this is how it will look liked:
I hope that helps. Do let us know if I misunderstood your concern.