In the problem 1005 the result is "3" for the stones 5 5 8 13 27 14, but in my opinion the minimal weight is "2".
LEFT = 27, 5, 5 = 37
RIGHT = 13, 14, 8 = 35

LEFT - RIGHT = 2, not 3 shown in this problem.

Is there a bug, or I'm wrong ?

First number is a count stones. Minimal weight is 3:
5 27 and 13 14 8