Every vote counts, except possibly yours!

An article from Computerworld says that a voter registration database system in California may prevent eligible voters from voting in a June 6th statewide election.
"For example, 14,629 out of 34,064 voter registration forms - or 43% - were "kicked out," or rejected, in Los Angeles County between Jan. 1 and March 15. Such results have election officials statewide fearing that the new registration system will bump eligible voters from the voter rolls."
43% of possible voters not being able to vote should be a huge issue. The registration database was mandated by the federal Help America Vote Act (HAVA). The law requires that each state establish a centralized voter registration database. How come lots of things associated with HAVA seem to make it harder for America to vote?