Extra note in arkivverket image

Hey all. Back again with another strange one hopefully someone has seen and understands? I'm looking up Johannes Olsen who is supposed to have been born August 17th, 1828. I managed to find the page with his record but someone has inserted a piece of extra paper on top of it with some record information added to it. However Johannes is my 3x great grandfather's brother. I have photos of them and they were definitely brothers. For a while I thought that John Olsen (b 1846) was really Johannes but on Johannes's death certificate they gave 1828 as his birth year. Has anyone seen this before? Thanks! [View image]