Forms on Mobile devices loading pictures

Hi,

Hope someone might have come across this before.

We have a website with multiple forms setup using CformsII and everything works ok when the website is viewed on a PC.

If we view the website on a Phone or Tablet, when we click into a form to enter data, it initially display a keyboard, then goes off and displays an image from that webpage.

Have tried it on iPhone, Lenovo tablet and Pixel 2 phone, all produce the same result.

Any ideas much appreciated.