WIKI
Dornan later dropped out of the presidential race and ran for reelection to his seat in the House; he was defeated by Democrat Loretta Sanchez by less than 1,000 votes.
Following the narrow defeat, Dornan alleged that Sanchez’s winning margin was provided by illegal voting from non-U.S. citizens. A thirteen-month House of Representatives investigation ensued, during which Sanchez was seated provisionally, pending the inquiry. A task force found 748 votes that had been cast illegally—624 from non-citizens in addition to 124 that had already been thrown out by California officials. This was not enough to overturn Sanchez’s margin of victory and she was allowed to keep her seat. However, in consultation with the INS, the House committee identified 4,762 questionable registration affidavits.
https://en.wikipedia.org/wiki/Bob_Dornan
https://www.cnn.com/ALLPOLITICS/1998/02/13/cq/sanchez.html
“Contending that INS records are replete with errors, Democrats have maintained that only by doing interviews is it possible to verify that a voter may have registered prior to becoming a citizen. INS officials have supported that view.
“Republicans, however, have insisted that it is possible to get a verified match of a voter with INS records, including names, birth dates and addresses.”
https://www.latimes.com/archives/la-xpm-1997-nov-08-mn-51539-story.html
I trust Dornan’s camp over wiki and the MSM’s take.
There were a lot more discrepancies than mentioned in the info you offered.
Not only did Loretta get to keep her job, her sister joined her later in the House. Weren’t we lucky!!!!