Transform.Position.Y is slowly decreasing but the player is not moving.

I have my player object sitting on terrain at y=120. i have put a debug.log statement that prints out the transform.position.y every update. They player is not moving up or down, merely staying put on the terrain, but the transform.position.y is slowly decreasing over time. I am trying to use this positioning to shoot bullets, but after a few seconds the bullets are spawning underground. Even in the inspector for the player's position is staying put at 120. What could be causing this, how can I fix it?