Circle collider bigger than it actually is

I have an animation that makes a circle get bigger, then loop. I added a circlecollider2D to this circle, but when the player (who has both a circle collider and a rigidbody2D), comes near, it keeps going up and down without even touching anything, as if there was an invisible padding between the two. Any advice would be appreciated, thanks!

The CircleCollider2D on the player was bigger than the player sprite itself. oops