Geni is designed that way. If more than one profile was created for the same person, they should be merged. If merged, the managers of each will be a manager of the merged profile.
Using pushpin to find out the other Manager's relationship to your father, I get
Muhammad Shihab is Habib Ahmad Shahab's second cousin once removed's husband.
That is close enough to be in your father's Max Family, so has a perfect right to be a manager of your father.
However, he probably did not have all the info, and some may have been garbled.
You can send him a Direct Message and maybe work together with him to get things straightened out
If you need any help getting information and/or relationships corrected, help is available. Best place to ask: https://www.geni.com/discussions/257430