Wrong convolution of 2 functions

Dear root users, I have a strange calculation of convolutions of 2 defined functions gaus and exponent.
The result graph in some places randomly has 0 value… And I have some parody on the exponent. See below.

So I cant understand how to solve it. I have tried another method of making Convolution through TF1Convolution but it gives the same results… Can someone help me with this one? I will really appreciate that.
Have a nice day, all!Besh.cxx (2.5 KB)

I think @moneta should be able to help you…

I blame the ROOT’s “Integral” method, so try with FWHM=10 …

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