Malahulc Eysteinsson us duplicated in your tree (https://www.wikitree.com/genealogy/Toeni-Family-Tree-21) and so are then all his ancestors, and so do not know which one to use in my tree .
Thanks Stephen
It's not a duplicate profile. Eysteinsson-12 appears twice in the generated tree due to pedigree collapse when cousins marry. There is only one profile to use.