Lost of impulse responses?

why there is only one impulse response with respect to n in the first graph, while the other two graphs with a complete set of impulse responses of all the 6 variables?

if anyone can help me? i appreciate it very much.
aa.mod (2.78 KB)

The reason is simple: Dynare does not plot IRFs for variables that do not move following a given shock. In your case, the only variable which reacts to the first shock is n.