Update x positions, the same way z is

xpositions.js

 //x positions
          else if((this.floor[i].position.x - this.tileWidth)>camera.position.x){
            
            this.floor[i].position.x-=(this.tileWidth*2);
          }
          //if the camera has moved past the entire square in the opposite direction, move the square the opposite way
          else if((this.floor[i].position.x + this.tileWidth)<camera.position.x){
            
            this.floor[i].position.x+=(this.tileWidth*2);
          }