New South Wales
You never draw only two. Level 1: 1 extra, level 2: 3 extras (1+2) and level 3: 4 extras (1+3).
If you do otherwise it is because you thing there is errata in card
You're actually incorrect.
The higher levels replace the card draw from the lowest level. This is how all cards work. So you draw 2 extra at level 2 and 3 extra at level 3.
No errata is needed, although I can see where you got your faulty assumption from.