Anterior placenta question.

This isn’t a concern or anything I’m worried about just a random question/thought I had.

So with the anterior placenta, a lot of moves happen without me feeling and other moves happen but are only felt very lightly, right? I’ve seen her move on an ultrasound and not feel a thing.. so I know it happens.

Why when I rub or lightly poke my belly or do certain things to get her to kick (cold beverage, sweet food/beverage, music, flashlight etc..) I usually feel those movements.

What’s different from those movements and her other general movements that I’m able to feel them?