Proton nuclear simulation issue (MCNP6)

Hi,
I'm simulating in MCNP6 the reaction of proton beam on targets but in the simulation the 96% of the proton are lost for energy cutoff.
I don't understand why happen that. I use a tally4 to obtain the reaction in the target, but I suppose the results are wrong because the lost of protons (if they are lost they can´t interact isn´t it?)

Any idea?

Thanks,
Eva
 
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Thanks for the thread! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post? The more details the better.
 
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Eva,
Can you tell us the energy of the protons and the material of the target ?
 

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