Hi,
Display of photos in search results pages are usually based on underlying metadata.
This could either be an embedded thumbnail URL containing in a metadata field, or the URL to the thumbnail might be constructed in the template from various metadata elements (such as a staff ID) to construct the URL to the image.\
You'll need to check to see where the thumbnail image is being sourced from inside the template and then check to see what metadata is being indexed to trace back to where the fault is.