field.smooth on rg_space produces non-sensible results on multiple spaces

from nifty import *
x = rg_space((8,))
f = field((x,x), val=1)
f.val[3] = 10
f.smooth(spaces=0, sigma=0.0001).val

The result of the last operation does not make sense, as the columns are

<distributed_data_object>
array([ 1.00000104,  0.99999867,  1.00000355,  5.49999423,  1.00000607,
        5.49999423,  1.00000355,  0.99999867])

instead of

<distributed_data_object>
array([ 1.00000104,  0.99999822,  1.00000607,  9.99999023,  1.00000607,
        0.99999822,  1.00000104,  0.99999911])