gstat: problem with prediction value at point location

Hi
when I tested prediction values kirging result I found that
values at 
pixel exactly at point location has the same values as
points. It gives 
that in points appear thin peaks with values strongly
different from 
neigbours. It looks like gstat do not use prediction values
but used 
exact values.
Variogram I used had the nugget

Jarek

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