That's the way it's supposed to be. I only had a Secret, but it worked the same way. Even with the clearance, that's only clearance to see what you need to know. If you don't have a need to know, your TS clearance doesn't give you carte blanche to look at anything you want.
My wife had a Secret clearance, or maybe it was TS, a few years before we got married when she worked for Lockheed*. Something to do with the Space program. She was amazed a couple of days ago when she saw on the Science TV channel and they were blabbing about stuff that she worked on -- and still probably can't talk about.
*a week or two after she started work, some wiseguy told her to go check with whomever to see if her clearance was back yet. So she did, and of course was chewed out for wasting his time because they never come back that fast. "Since I'm here, could you at least check" He did, reluctantly, and there it was. "What are you, a Sunday School teacher?" "Well, as a matter of fact..."