自動交易美股回測系統壞了

請問自動交易美股回測系統是不是壞了?

同一份程式碼原本可以回測，現在全部都失敗

以下是我原本的程式碼

variable: up(0), down(0), mid(0), SMA(0), profit(0);

up = bollingerBand(close , 20, 2);

down = bollingerBand(close, 20 , -2);

mid = (up + mid)/2 ;

SMA = average(close, 5);

profit = (c-filledAvgPrice) /filledAvgPrice;

if (lowD(1)< down[1] or lowD(2)< down[2]) and closeD(1)> down[1] and c > highD(1) then setposition(3);

if position =3 and c < down then setposition(0, market);

麻煩小幫手了謝謝