I think I solved the problem. In my INDD file for each chapter, in this case each chapter is another year, at the beginning of the chapter I place a full page image and then on the next page is the text that starts the first article. That text has a title and the title has a style that adds it to the TOC of the INDD file. What I had done was place my curser in front of the title and attached a full page graphic inline so since it was inside the TOC style, it added the graphic to the TOC (only visible in the actual epub in the TOC panel) as a blank line. You could still click the line and it would take you to the full page graphic.
To remedy this, I first deleted the image form it’s current spot which left me with a blank page. I put my curser in front of the title that now had a blank page in front of it and clicked Delete which moved that page of text back one page (getting rid of the blank page.
Next I inserted my curser at the end of the previous text thread and attached the image again, scaled it and positioned it off page in the art board area and then exported. The blank is now gone and the file validates for that instance of it.