Occasionally, the number of rows in a table* is not really the number of rows in the table. Sometimes this peculiarity only makes itself known when you export a table and only see a subset of the total rows in the original attribute table ... where all the other rows go to?
One reason that this happens (perhaps the most common), is that when you use the "keep only matches" option when doing a join, the non-matched rows are kinda there, and kinda not. To fix this you would need to go back and use the "keep non-matched" option.
*as counted by the "Records (1 out of x)" at the bottom of an attribute table window
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