Hi, so this what I eventually did. I submitted just the bio-data page of my valid passport and a LOE saying my passport is new and has no visas, markings or stamps; since that what the instruction said. There is really no point uploading my old passport, if they wanted a valid passport. For my spouse and son, I included all pages with stamps and visas. I really do think it is glitch, because we are not IEC, but I would advice do what you can defend (which is the instruction), it was still in there after I submitted.
Good luck!