Unconventional IRF shape

Hi everyone.

I have a New Keynesian DSGE model when I run this model everything is Oki but the
shapes of IRFs are not normal.
ANEWMODEL.mod (4.8 KB)

As you can see shape of IRFs are not similar to conventional or normal IRFs.
Although there is not any error in Dynare output results and IRFs converge to zero after some period of time.
I think that the problem may goes back to the modeling of Tax , Bonds and Government expenditures.