Associative hatches are linked to their boundaries, and update when their boundaries are modified. 
Non-associative hatches are independent of their boundaries. 
To set hatching to be associative, check Associative Hatch on the Display page of the Drawing Setup (Options / Display).To break the link between an associative hatch and its boundary, select both the boundary and the hatch, and select Dr op Link from the Inspector Bar or local menu. 
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