When my character walks left and right on a tile map, the value of rb.velocity.y is often not zero.

I'm developing side scrolling game using a tile map. RigidBody2D's Velocity.y value is 0 when moving from right or left, so the jump animation is not activated.

     if ((rb.velocity.y < 0.1 ) && (rb.velocity.y > -0.1))
         // if (((rb.velocity.y < 0.1) && (rb.velocity.y > -0.1)) || raycastHit.collider != null)
     {
         anim.SetBool("isJump", false);
         anim.SetBool("isFall", false);
     }
     

When my character walk unexpectedly over the tilemap, the value of rb.velocity.y may go up. This results in a jump animation that moves from side to side.

I searched for it to check Used by Composite in Tilemap collider 2D and add Composite Collider 2D. RigidBody2D was automatically attached and I set the body type to static. So when main character walk from side to side on the flat land, the value rb.velocity.y = 7.643655E-09 keep appears, so the run animation is not working.

Or how can I solve it?