More than likely you have accidentally opened the InDesign document that's in the PrintUI "packaged templates" folder instead of the original. This is very easy to do because InDesign shows that document in the "recent documents" list. Use File/Open and then navigate manually to the correct folder for the original document.
Please also be sure that you are using the most recent PrintUI Management panel. Go to https://printui.com/developer to download the installer. Log in using the same credentials that you use for the panel.