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Here, I am assuming you have an image in its "Original Layer" and when you did generative fill, it created its output onto a different layer, lets call it "Altered Layer". So, at this stage, you have "Original Layer" with people and "Altered Layer" with certain people removed. Now, if you are trying to remove more people from another part of the Original Layer,

1) make sure you are selecting the Original Layer

2) make sure that the Altered Layer is not blocking the parts of Original Layer's newly selected people.

It makes for an easier explanation with example at hand. Screenshots of your work and layers panel will help.