If you are using template models the orientation of the 'Top' plane may have been changed. It's easy to create a template that matches the desired orientation or create a part to use as a basis for new parts.
There have been various discussions in this forum about orientations, and I never cared enough to pay attention, mostly because too many users would create models based on what they would call 'Front' or 'Top' (for example) without regard to how the part was detailed or installed.
