Hi - yes that happens sometimes don't know why.
Maybe you can recapture the attention of the forum if you start a new thread. Would be interesting to have the date of marriage for Lauritz and Fredrikke Kirstine confirmed, and to find out more about Magda's siblings. Many of the volunteers would be more expert at that than me. All of the siblings were much younger than Magda, since her father did not remarry until a number of years after Magda's mother died. Or...maybe you already know their stories.
Here's a transcription of that passenger manifest you told us about.
Sailing on the Frederik VIII
Departing Copenhagen 29 April 1915
Arriving New York 11 May 1915
Magda Kathrine Knudsen [transcribed as Mayda on Ellis Island site]
Age 25, housekeeper
Last permanent residence Copenhagen
Name and address of nearest relative or friend whence alien came:
Father Lauritz Knudsen at Rantzausminde Skole [school], Svendborg
Final Destination: Wilmington, NC
Whether having a ticket to final destination: Yes
By whom was passage paid: self
Whether in possession of $50: Yes
Whether ever before in the United States: No
Whether going to a relative or friend: Mrs. L. Greer, 116 Market Street, North Carolina
DIS to Emilie Michaelsen. [ I don’t know what this means; this note is written over her
height and other description, making it hard to read]; light hair, brown eyes.
There are a lot of Danish research materials with details about teachers; I myself don’t know how to access them, but I have received information from them! A future research project for you, haha.
BTW a clarification - when I said I'd guess you'd find records for Lauritz's father that omit the name Skytte, and perhaps some that omit the name Knudsen - I meant his male-line ancestors, not just the father, and that some might omit the patronymic name whether it be Knudsen or another patronymic.
Nice to meet you and happy hunting!