IRF Result! HELP!

I just got the IRF results. But it seems to be wrong. I used stoch_simul()
Why the variable “x” and “ex” are constant? I set a positive shock to the disturbing term of “x”, and “ex” is supposed to be negatively correlated to “x”. The other variables are also strange. Because they can’t return to the steady state.
Were my results wrong?
PLEASE HELP ME!!! THANKS!!!

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