Square Root

[basbasbas]

I tried to create a square root using the operator 'Power'. See the
file named 'square root error.bmp'.
(sorry for the size....I forgot to compress it). The input for the
power is 0.5 but the operator returns it into 5.0
I am using grasshopper 050070. Is this a known error? Can anyone
help?  Cheers, Bas Goris