Magic edit

When I try to insert a different model into an existing photo by using the magic edit feature (ie I select the model I want to insert into the photo, then click magic edit and highlight the person In the photo that I want removed and replaced by the model I just selected for insertion) it doesn’t work. The resulting images do change the look of the person I attempt to replace, but it’s definitely not the model I selected to insert into image (it’s not any of my models for that matter).