It is possible that Pic-a-POD or one of the POD web sites may get confused about which picture goes with which day or Pic-a-POD may not have downloaded a picture correctly.
To fix this, right click on the thumbnail in the main window and choose "Refresh" from the contextual menu.
Pic-a-POD will re-check all the details for that picture and replace the current information with the new data.