清仓指令如下，最后1min成交都很活跃，为什么执行以下命令后账号中仍然有持仓呢，如何解决？

//尾盘清仓

if(MarketPosition == 1 and ((time >= 0.145900 and time <= 0.150000) or     (time >= 0.225900 and time <= 0.230000) or     (time >= 0.022900 and time <= 0.02300)))

   {

       Sell(0, low);

   }else if(MarketPosition == -1 and ((time >= 0.145900 and time <= 0.150000) or     (time >= 0.225900 and time <= 0.230000) or     (time >= 0.022900 and time <= 0.02300)))

   {

     BuyToCover(0, high);

   }