I was unable to find a cause for this, although it appears that the articles were entered improperly. From this group of only five journals, it is impossible for me to name the cause of the formatting errors. Changing the font size in an article with tables should activate the horizontal scroll bar, if the tables extend off the edge of the window. In one case, the horizontal bar was not activated until I'd scrolled vertically back and forth several times, looking at other portions of the article. I was unable to determine the workaround to predictably cause the horizontal scroll bar to become activated when I needed it to see the remainder of a table.
Solutions are to make the font small enough or to enlarge the window.
The information on the disc is excellent and highly useful.