Not sure what notification you are referring to. You have posted in a public discussion area.
I make make a guess that it was a Tree Match, or Merge request?
I can see that your parents already exist on the Geni World tree in addition to the profiles of your parents that you have created. On Geni, the goal is not for every individual user to create their own trees but for us all to collaboratively work on a single tree. Merging the two versions of your parents together will let you and other cousins on Geni work together in the private areas of family that overlap or on public areas of the tree.