Is this case normal?

As a Garmin fan, I have the FENIX3 FENIX5 D2CHARLIE and MK2I, but the MK3I is my first Garmin watch with amoled screen. I have noticed a phenomenon, I don't know if it's normal.

After the screen is dormant for a period of time, touch to light up the screen, and you will find that the screen gradually becomes brighter, rather than directly reaching the set brightness.

But if you repeatedly touch to wake up the screen in a very short period of time, the screen will always stay at the set brightness.

Is this a normal phenomenon of AMOLED screens?