BBANDS strange results

[evandroPulga]

I'm trying to use the bollinger bands method but it's producing a strange result. I pass an array of 500 numbers as inReal and 20 as timePeriod, the middle band output seems ok, but the lower and upper output has only 19 ok values, the rest of the arrays are just zeroes. Am I doing something wrong?

[mozeryansky]

Same