Without explaining what you are truing to do its hard to give an answer. At a guess you may be describing that your extraction is going in the wrong direction. Negate the extraction. On the tool you are trying to extract from and go to display properties (main tool menu) and check double is not lit. if the tool appears inside out hit flip and try to extract again. If this is not the case try to extract again but move the slider in the opposite direction.
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