I've never seen this before

I've been researching in Norwegian records for a number of years now and I thought I'd seen any number of things. But this was a new one -- In 1819 Gran, Oppland the child Hans Syversen was born out of wedlock. Gran Ministerialbok nr. 9, side 98 (bottom of the page left) Ministerial Entry #11 The same event recorded in the Klokkerbok - Klokker Entry #11 Ok, fine. Both those records agree. The father is listed as Syver Larsen of Lands Prestegjeld. Now for the interesting part. Hans Syversen's confirmation record in 1834 lists his father's name as Syver Hansen. Not Larsen -- HANSEN. Entry #36 I've never seen this before... aren't things interesting!! If you with more experience at this have any bits of advice or comment, I would welcome them. I am researching in all the usual sources and have currently expanded my scope to include the Land and Hadeland probate records. (I have no problem with the child's mother, Anne Erichsdtr. She's been relatively easy to sort out.)