Garmin Instinct Solar Surf Button issue

I bought a instinct solar surf and noted the light button seems to have more play when pressing it very slightly... The other buttons have no movement when I apply the same amount of pressure to them... I am concerned that this might lead to issues down the line when I am in the surf. Anybody else with the same issue? Or is this just how it is? Don't want sand and salt water getting in there and causing trouble. 

When pressing the button fully it behaves the same as the other three.....

Thanks