As seen in the picture - the Assign activity called “Assign B” writes a value to both array variables - arr_MileageValues and arr_MileageValues2, as seen in the “Locals” window, with red outline.
the For Each activity that contains the “Assign B” activity has been explicitly instructed to only write to arr_MileageValues2.
As can also be seen in the “Locals” panel, the current iteration number, or index is 1, meaning 1 iteration has been done up to this point, which is also reflected in both array variables.
The correct value for the first item of the array variable arr_MileageValues is connected and shown via blue lines. After the first iteration of the loop the value of the first item in arr_MileageValues should be - " Up to 100 miles (24,496)" instead of “Up to 100 miles”. The same correct value can be seen just above arr_MileageValues in the “Locals” panel, in the string str_MileageValues, which the array was derived from.