Widget not updating image

Hi Folks,

Since updating from page builder 2.4.25 to 2.6.1, a custom widget image is not updating properly when we save the page.

The editable image works before saving, in that the image preview on the edit screen after updating the image shows the correct image, but when saving the page the old image is returned.

Here is a link to our custom widget.

All other functions of the widget work fine.

Help appreciated.

Steve