The Electoral Commission has apologised over errors in the vote count at three polling booths. 

It's checking all results after admitting a data entry error caused hundreds of votes to be assigned to the wrong party. 

At a booth in Port Waikato, more than 500 votes intended for National were wrongly assigned to the Leighton Baker Party. 

Another booth in Port Waikato, and a polling station in Ilam, both had the incorrect count. 

Chief Electoral Officer Karl Le Quesne told Mike Hosking that they're re-checking candidate votes at the moment. 

He says most were processed yesterday and there are possibly a few more errors, but they're just confirming that today. 

LISTEN ABOVE 

• 'Full check': Electoral Commission reviewing voting results after Herald identifies error
• Voting discrepancies "one of several issues" to be addressed in electoral process review