Arnulf I the Great, count of Flanders - Confusing contradictions from weak research?

you are descended from both

You can check for sibling lines of descent by using the green push pin to the right in the relationship path box. Happens all the time - in one line, I am descended from 6 of 9 siblings

Also, you might find your 3rd GGP, for example, descends from 2 or more siblings due to intermarriages

Pedigree collapse. Nothing strange going on here. It's normal.

Geni uses the shortest path algorithm. The database works just like in a GPS navigation. I've already asked the Geni team to add extra features to the search, such as tracing the "route" between two profiles by passing through a third profile, provided by the user. If you do not have a "path" passing through this third profile Geni performs the usual path. But it seems the Geni administrators do not find this relevant! Do they have a tree in Geni? ;-)

I file them under re-connects. Through out time family find each other again. Some times I even get different results from GENI. I have learned to record everyone so I can find the re-connects.

Arnulf I the Great, count of Flanders is your 33rd great grandfather...:)

Marguerite Middleton (Landis)
her mother → Henry J. Landis
her father → Harriet Bissell Barrett Landis
his mother → Daniel Voltaire Bissell
her father → Daniel Bissell (spy)
his father → Elizabeth (Loomis) Bissell
his mother → David Loomis
her father → David Loomis
his father → Nathaniel Loomis, Sr.
his father → Joseph Loomis, I
his father → Agnes Loomis
his mother → John Lingwood, of Braintree
her father → Mary Lingwood
his mother → Susan Jocelin
her mother → Anne or Anna Josselyn
her mother → Margaret de Neville, Baroness Cobham
her mother → Edward Neville, 3rd Baron of Bergavenny
her father → Joan Beaufort, Countess of Westmorland
his mother → Katherine Swynford, Duchess of Lancaster
her mother → Sir Paon de Roët
her father → Payne de Roët, of Guignies
his father → Gilles I 'Rigaud' du Roeulx
his father → Eustache IV 'Campulus', seigneur du Roeulx et de Morlanwelz
his father → Eustache III 'Canivet', seigneur du Roeulx
his father → Eustache II 'le Valet', seigneur du Roeulx
his father → Eustache I 'la Vieux' de Hainaut, seigneur de Roeulx
his father → Arnoul de Hainault
his father → Baldwin II, count of Hainault
his father → Baldwin VI, count of Flanders and Hainault
his father → Baldwin V, count of Flanders
his father → Baldwin IV, "Le Barbu" count of Flanders
his father → Arnulf II the Young, count of Flanders
his father → Baldwin III, count of Flanders
his father → Arnulf I the Great, count of Flanders
his father