transform.Translate and transform.eulerAngles bug

Hello, I'm using transform.Translate for walking:

 player.transform.Translate(Vector2.right * moveSpeed * Time.deltaTime);

and

 player.transform.Translate(-Vector2.right * moveSpeed * Time.deltaTime);

And rigidbody2D.AddForce when I want to jump:

 player.rigidbody2D.AddForce(Vector2.up * jumpHeight, ForceMode2D.Impulse);`

It's working fine. Now I wanted to add a little rotate effect when it's in air. I did it by transform.eulerAngles:

 case Go.up:
     katzmiany = 3 * speed;
     rotationPlayer = new Vector3 (0, 0, Mathf.Clamp (rotationPlayer.z + katzmiany, 0, 30));
     transform.eulerAngles = rotationPlayer;
     break;
 case Go.down:
     katzmiany = -3 * speed;
     rotationPlayer = new Vector3 (0, 0, Mathf.Clamp (rotationPlayer.z + katzmiany, 0, 30));
     transform.eulerAngles = rotationPlayer;
     break;

And again it's working fine. But only when I'm not walking. When I go right my jump is higher. When I go left my jump is lower. It happens only when my script for rotating is working. What should I do?