Her father is not Markgraf Johan von Brandenburg. and she is not married to Erik Klipping
https://da.wikipedia.org/wiki/Johan_1._af_Brandenburg
Her half-sister, Agnes was the wife of Erik V Klipping, king of Denmark.
Markgrafin Brigitte von Sachsen, Markgräfin von Brandenburg
Markgrafin Brigitte von Sachsen, Markgräfin von Brandenburg
Her "father"(?, idk) has had duplicate wives for more than two years.
Agnes married to Erik Klipping have a sister Matilda -Mechthild, married to B ogislaw IV from Pommern. I can not find that this Matilda von Sachsen is here half sister.
http://fmg.ac/Projects/MedLands/BRANDENBURG,%20PRUSSIA.htm#JohannId...
https://www.geni.com/discussions/158450?msg=1341179
Ingvild Alme, Matilda and Agnes are full-blood sisters, but the duplicate mothers are making them appear to be half-sisters. I've cross-posted this discussion on the discussion referenced above for you, where one of the curators may address the problem.