Why table Most Popular Pages visitors subtotal and total figures are N/A?

In Access Statistics category, tables Most Popular Pages, Most Downloaded Files, Most Requested Images and Most Requested Directories, their visitors subtotal and total figures are both marked as N/A. What do they mean?

However, tables Top Entry Pages, Top Exist Pages and Top Path Through Site, their visitors subtotal and total figures are not N/A (have values). What is the difference between these two group of tables?

Thanks!
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