lepton number smaller than expected

I am working with MG5_aMC_v2_7_3 generate a SM process p p > t t t~ b~ , ( t > b w+ , ( w+ > l+ vl )) , ( t~ > b~ w- , ( w- > j j )) .
The cross section was just as fine as I expected. But when I analysis tag_1_delphes_events.root using ROOT. I can only find 4212 electron and 5733 muon. Here I have 2 w+ bosons in the final state,and each w+ decay into a lepton and a neutrino,so I think there should be more lepton. There is some default cut in run_card.dat ,but I have no idear how many lepton it will cut.
PS:The process I was generated with default set.
Multiparticle defined as:
Defined multiparticle p = g u c d s u~ c~ d~ s~
Defined multiparticle j = g u c d s u~ c~ d~ s~
Defined multiparticle l+ = e+ mu+
Defined multiparticle l- = e- mu-
Defined multiparticle vl = ve vm vt
Defined multiparticle vl~ = ve~ vm~ vt~

THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!