The other two election day matters relate to an email being sent to voters and an election sign on display.
"It is an offence under section 197 of the Electoral Act 1993 for a person to interfere with, or influence voters on election day," the Electoral Commission said in a statement.
Three other matters have also been referred to police.
"One matter relates to a false statement on a special vote declaration, contrary to regulation 68 of the Electoral Regulations 1996.
"Two matters relate to a failure to include a promoter statement on referendum advertising, contrary to sections 52 and 75 of the Referendums Framework Act 2019."
The matter is now with the police, the commission said.
Police said the appropriate spokesperson for the matter was not available this evening.
The Electoral Commission would not comment further on the matter when approached.