A computer glitch, combined with a rush of last-minutes votes, was behind the late release of election results on Saturday.

Results from the Whanganui District Council local government elections were expected to be made public around 3pm on Saturday; but they were released at 5.15pm.

Whanganui's electoral officer, Noeline Moosman, said there was an influx of votes returned on Saturday morning. The Wanganui Chronicle understands around 1,100 votes - or 6 per cent of total votes cast - were received on Saturday morning.

"[This was] more than anticipated and accordingly the processing of these votes took longer than expected," Ms Moosman said.

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The results were also released only after all candidates had been informed whether they had been elected or not.

"Whanganui has a tradition of informing each candidate of the results before releasing the details to the public."

Ms Moosman said the council's website was one of several local body sites on the Datacom platform that crashed on Saturday afternoon.

"The issue with Datacom's service appears to have been caused by the large number of people trying to access election results across all council websites it serves. We are awaiting a full analysis and incident report from Datacom about the failure of the service," she said.