Though we have total count at the bottom of the Matix, why there is the count at first row with blank header ? I'm clueless.
Note: I choose "Count(Distinct)"
Kindly do the needful 
You'd need to show more of your model to get to an accurate answer. It could be that you simpliy have 652 rows for which the ComponentID is blank. Or, if you have a 1-to-many relationship through Component ID to another table, it could be that you have the table on the 1-side has component IDs that do not appear in the many-side table. Those will potentially be shown as blank, depending on how you build the visual.
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Cheers
