Incorrect 232Th decay chain

I was running the simulation serially, only.
I think probably the hint to issue is discussed in this thread. But the problem is I am not aware of how to as discussed in the thread

apply a time cut (corresponding to your device’s trigger window) in your stepping action. If you’re recording the individual hits directly into an N-tuple, make sure you include the time stamp and you can apply that cut in your analysis.