Why the extra zeros?

Why are the extra zeros being appended to the array? Note the original function output starts 0.379m. My idea was to create a new array of values when the level gets over 1 m in height. Although I also tested to exclude zero the program block seems to ignore this restraint and append zeros to the resulting array. Why is this and can these zeros be removed because what I want is only the output values above 1 m.

Thanking you in advance.

Kind regards, Mark