After the associative space is updated and even if the base boundary is updated correctly, the net, usable, and gross boundaries may stay as they were before the update.
If the net, usable, and gross boundaries of an associative space do not get updated when the base boundary is updated after a change in the boundary objects, the space uses manual boundary offsets. 
Net, usable, and gross boundaries not updating
Manual net, usable, and gross boundaries do not automatically react to changes in the base boundary. To make the net, usable and gross boundaries update automatically when the base boundary is updated, you need to define the boundary offset of the space as By Style or By Standard on the Properties palette.