Just remove the dates.
Most sources from that time period are sagas without any indication of dates and when you find dates on profiles it is usually fabricated by people who insist on having dates.
When two profiles are merged with different estimates you might end up with such a result. Geni are also missing basic genealogical date qualifies like before, after and between to tell that.
You should also know that even if the estimates is somewhat correct related to an event we can put a date on you will find some breaks in the logic and suspect that there must be missing some generations.
The reason is that in the Nordic as in many other cultures a source citation translation to "he/she was the son/daughter of some famous person" does not necessary men a direct son - it just means a direct ancestor like a grandson or more. In some lines like the biblical there are logical breaks that is up tp 30 generations if I remember correctly.