2 animations keep switching at a rapid pace

I am working on a personal prototype for a open world game and i am currently trying to make my first enemy ai. This is the way i have it set up:

• The first second it spawns it records its spawning location into a vector3 var known as lastpos.

• It stays at that location with an idle animation playing (moving = 0)

• There is a sphere trigger around the enemy so when the player collides with the sphere it detects the player, it starts playing the running animation and starts chasing the playing (moving = 2)

• when the player is not longer colliding with the sphere it walks back to lastpos while playing a walking animation (moving = 1)

• when it goes back to its lastpos and the animation will go back to being idle.....or it should....

the problem i have with the last dot point is that my "moving" variable which is written to control the animations of the model keeps switching between 0 and 1 (or in other words the animations keep switching between idle and walking) and i have no idea whats going on. Its my first time designing an ai from scratch, if anyone could help me that would be great!

 void Update () {
         playerVector = player.transform.position;
         gruntAnim.SetInteger ("moving", moving);
         gruntAnim.SetInteger ("battle", inBattle);
         moving = 0;
         closeToPlayer = playerRange.GetComponent<combatDistanceToPlayer> ().enemyClose;
         inBattle = 0;
 
         if (playerDetected == true) {
             nav.destination = player.transform.position;
             inBattle = 1;
             moving = 2;
 
             if (closeToPlayer == true) {
                 moving = 0;
                 gruntAnim.SetBool ("attackablePlayer", true);
             } else if (closeToPlayer == false) {
                 moving = 2;
                 gruntAnim.SetBool ("attackablePlayer", false);
             }
             //is the player currently detected and if he isnt then is the goblin back at the last position?
         } else if (playerDetected == false & this.gameObject.transform.position != lastPos) {
             nav.destination = lastPos;
             inBattle = 0;
             moving = 1;
             }
         if (this.gameObject.transform.position == lastPos) {
             moving = 0;
         }
     }