What's causing this in my 2D AI script?

I'm trying to make AI for my beat-em-up, so far just a simple following waypoints and chasing the player. I've gotten stuck at every corner, and I'd like some help from someone so I can see where I'm going wrong.

Here's my Code:

 void Update ()
     {
 
         if ((chaseTarget.position.x - spriteObject.transform.position.x) > attackRange)
         {
             Move(chaseTarget);
         }
         else if ((chaseTarget.position.x - spriteObject.transform.position.x) <= attackRange)
         {
             Move(chaseTarget);
         }
 
             
         else
         {
             Idle();
         }
 
     }
 
  void Move (Transform target)
     {
         //If the target is to the left of the sprite
         if (target.position.x < spriteObject.transform.position.x)  
         {
             velocity.x = -walkSpeed * Time.deltaTime;  //Move to the left
             sprite.scale = new Vector3(-1, 1, 1);      //Flip sprite to look left
             animController.walking = true;             //walking animation
         }
         //Alternatively, if the target is to the right
         else if(target.position.x > spriteObject.transform.position.x)      
         {
             velocity.x = walkSpeed * Time.deltaTime; //Move right
             sprite.scale = new Vector3(1, 1, 1);     //Flip to look to the right
             animController.walking = true;           //walking animation
         }

         //If the target is above the sprite
         if (target.position.y > spriteObject.transform.position.y)          
         {
             velocity.y = walkSpeed * Time.deltaTime;  //Move up
             animController.walking = true;            //waling animation
         }
         //Alternatively, if target is below sprite
         else if (target.position.y < spriteObject.transform.position.y)     
         {
             velocity.y = -walkSpeed * Time.deltaTime;  //Move down
             animController.walking = true;             //walking animation
         }
 
         worldMover.Move(velocity);                     //Move based on the velocity vector
 
     }

This code causes this:

Any idea why?