ThirdPersonCharacter script blocks trampoline jump

(I'm brazillian, sorry for the english) My trampoline script:

using UnityEngine; using System.Collections;

public class Trampoline : MonoBehaviour {

 Animator anim;
 [System.NonSerialized]public bool onTop;

 GameObject bouncer;

 public Vector3 JumpPower;

 void Start () {
     anim = GetComponent<Animator>();
 }
 
 // Update is called once per frame
 void Update () {

 }

 void OnCollisionStay(Collision other)
 {
     if(onTop)
     {
         anim.SetBool("isStepped", true);
         bouncer = other.gameObject;
     }
 }

 void OnTriggerEnter()
 {
     onTop = true;
 }

 void OnTriggerExit()
 {
     onTop = false;
     anim.SetBool("isStepped", false);
 }

 void Jump()
 {
     bouncer.GetComponent<Rigidbody>().velocity = JumpPower;
 }

}

others objects jump fine, and if I disable just one of the two ThirdPersonCharacter scripts of my character work too, I try many things but I can't make it work, if you want to see the a little bit of ThirdPersonCharacter script, I think this is caused by velocity var(Vector3) and the manipulation of useGravity Comand, thank you for the patience:

     void Update()
     {
         if(onGround)
         {
             doubleJumped = false;
         }
    public void Move(float h, float v, bool crouch, bool jump, Vector3 lookPos, Vector3 move)
     {
         if (h != 0f || v != 0f) 
         {
             rotate(v,h);
             
             animator.SetFloat ("Forward", 1f, 0.1f, Time.deltaTime);
         }
         else {
             animator.SetFloat ("Forward", 0f, 0.1f, Time.deltaTime);
         }
         //if (move.magnitude > 1) move.Normalize();

         // transfer input parameters to member variables.
         this.moveInput = move;
         this.crouchInput = crouch;
         this.jumpInput = jump;
         this.currentLookPos = lookPos;

         // grab current velocity, we will be changing it.
         velocity = GetComponent<Rigidbody>().velocity;

         ConvertMoveInput(); // converts the relative move vector into local turn & fwd values

// TurnTowardsCameraForward(); // makes the character face the way the camera is looking

         PreventStandingInLowHeadroom(); // so the character's head doesn't penetrate a low ceiling

         ScaleCapsuleForCrouching(); // so you can fit under low areas when crouching

// ApplyExtraTurnRotation(); // this is in addition to root rotation in the animations

         GroundCheck(); // detect and stick to ground

         SetFriction(); // use low or high friction values depending on the current state

         // control and velocity handling is different when grounded and airborne:
         if (onGround)
         {
             HandleGroundedVelocities();
         }
         else
         {
             HandleAirborneVelocities();
         }

         UpdateAnimator(); // send input and other state parameters to the animator

         // reassign velocity, since it will have been modified by the above functions.
         GetComponent<Rigidbody>().velocity = velocity;


     }

     private void GroundCheck()
     {
         Ray ray = new Ray(transform.position + Vector3.up*.1f, -Vector3.up);
         RaycastHit[] hits = Physics.RaycastAll(ray, .5f,groundCheckMask);
         System.Array.Sort(hits, rayHitComparer);

         if (velocity.y < jumpPower*.5f)
         {
             onGround = false;
             GetComponent<Rigidbody>().useGravity = true;
             foreach (var hit in hits)
             {
                 // check whether we hit a non-trigger collider (and not the character itself)
                 if (!hit.collider.isTrigger)
                 {
                     // this counts as being on ground.

                     // stick to surface - helps character stick to ground - specially when running down slopes
                     if (velocity.y <= 0)
                     {
                         GetComponent<Rigidbody>().position = Vector3.MoveTowards(GetComponent<Rigidbody>().position, hit.point,
                                                                  Time.deltaTime*advancedSettings.groundStickyEffect);
                     }

                     onGround = true;
                     GetComponent<Rigidbody>().useGravity = false;
                     break;
                 }
             }
         }

         // remember when we were last in air, for jump delay
         if (!onGround) lastAirTime = Time.time;

     }

    private void HandleGroundedVelocities()
     {
         velocity.y = 0;

         if (moveInput.magnitude == 0)
         {
             // when not moving this prevents sliding on slopes:
             velocity.x = 0;
             velocity.z = 0;
         }
         // check whether conditions are right to allow a jump:
         bool animationGrounded = animator.GetCurrentAnimatorStateInfo(0).IsName("Grounded");
         bool okToRepeatJump = Time.time > lastAirTime + advancedSettings.jumpRepeatDelayTime;

         if (jumpInput && !crouchInput && /*okToRepeatJump &&*/ animationGrounded)
         {
             // jump!
             onGround = false;
             velocity = moveInput*airSpeed;
             velocity.y = jumpPower;
             jumpParticle.Emit(3);
         }
     }

     private void HandleAirborneVelocities()
     {
         // we allow some movement in air, but it's very different to when on ground
         // (typically allowing a small change in trajectory)
         Vector3 airMove = new Vector3(moveInput.x*airSpeed, velocity.y, moveInput.z*airSpeed);
         velocity = Vector3.Lerp(velocity, airMove, Time.deltaTime*airControl);
         GetComponent<Rigidbody>().useGravity = true;

         // apply extra gravity from multiplier:
         Vector3 extraGravityForce = (Physics.gravity*gravityMultiplier) - Physics.gravity;
         GetComponent<Rigidbody>().AddForce(extraGravityForce);

         if(jumpInput && !doubleJumped)
         {
             velocity.y = jumpPower;
             doubleJumped = true;
             animator.SetTrigger("DoubleJump");
             jumpParticle.Emit(3);
         }

     }