Hmmm! I tried this and it gave me a client that does NOT have Sch E, pg 2. I then made a filter (for the left column) that display E, pg 2 just by clicking on it. I get the same list as I did with F3. I have a small practice now, so don't have a big database to test, but I agree with your assessment. 

Out of curiosity, are the missing clients locked? My one that showed up, but did not have a E pg 2 went away when I unlocked and did a form view.