Backtesting error work

Hi,

Please somebody explain me, why this kod make and cancel 100000 orders???????

 protected override void OnTick()
        {
         if (Symbol.Spread >= 0.4)
            {
                CancelOrders();
            }
            else
            {  

              ........   

                if (PendingOrders.Count == 0)
                {
                    PutPendingOrders();
                }
           }
      }

}

In 1 tick them put and cancel, put and cancel. (test length 1,2,3 days).

Please help!!!!!