You might have accidentally turned off the lead photo on your profile. At the top of the column where the photos should be, there is a link to turn on/off the photo. If you log in and clicks that link, the photos will come back again.
Photo is on and visible:
Photo is off, and you can't see the lead photo of each lot:
If you still can't see the photos in the listing, please contact MaxSold (firstname.lastname@example.org) with your browser and device details. Thank you, and hope this helps!