Question about ego sample TAB in multi-turn-QA's Leaderboard

Meta CRAG - MM Challenge 2025
#1

There are many top ranked Teams with scores 0 or NA’s on the board.
Is it a normal ?

#2

Yes this is normal. Because task 3 is all the same type of image. (I forget, it is either all ego or all non-ego). Therefore there is only 1 LB)