The GPS's atomic clock is affected by this also right?
I want to try something and get CD to check if it makes sense.
You wouldn't ask this question if we said that
no clocks are "affected" by this. They all tick along keeping perfectly good time within their frame of reference.
However, relativity theory has to transform between the different frames of reference and that produces different numerical values for a "tick" as you transform space and time variables. Neither clock (on earth or in the GPS satellites) are changed. But the calculations to compare them to one another (in whichever reference frame you pick) changes the numbers attached.
Does that make any sense?