Why do I have holes in exterior walls where roofs tie in?

Example... I have small storage room with shed roof attached to exterior gable wall of garage. A hole shows through the gable wall above where the storage roof ties in to garage wall. Why?????

I would attach a pic for explanation but do not know how :confused:

are attic walls turned on in display options?

Yes, attic walls is checked.

Figured it out for one area! Went up in attic and built a brick exterior wall since the wall section just beneath on 1st floor is actually the divider wall between garage and storage space. I know... hard to explain without attaching picture for detail.