"I had one child extra registered as mine. This seems very mysterious, I thought," said Tobias Wallin.
Wallin notified the Social Insurance Agency of its mistake, but nothing happened, the Swedish news agency TT reported Saturday.
Wallin said he was pushed from one administrator to the next.
"None of them had any clue about what was in their data," he said.
Then, Wallin said he received a letter from the agency saying he had applied for paternity pay for someone else's child.
"I reported the agency to the Data Inspection Board, because they have problems handling sensitive information," he said.
The Data Inspection Board quickly found that an administrator within the Social Insurance Agency accidentally had written Tobias Wallin's personal identity number instead of the real father's.
The mistake has now been righted and Wallin is only registered as the father of his own daughter.
"It's been a strange situation," he concluded.