Signage from the Yes23 camp has been spotted near voting centre signs with the same purple colour used by the Australian Electoral Commission.
Early voting in the voice referendum opened on Monday, ahead of polling day on October 14.
In a statement, the commission said it became aware of campaign signage at an early voting centre that could mislead voters.
"To be absolutely clear - the signs were erected by the Yes23 campaign, not the AEC," it said in a statement.
"This combination of using purple and white colours in proximity to AEC signage could mislead a voter about the source of the signage, and by extension, the source of the message on the signage."
The commission said it has requested the Yes23 campaign to move its signs away from theirs when they became aware of the situation.
"The Yes23 campaign has agreed to comply with this request," the commission said.
The 'yes' campaign signs had been marked with the authorisation statement required by law, it added.
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