I'm just seeing a fraction of my particles in paraview, what is the problem ?

The code is same as pour/dev example, but I've used nparticles 5000.

atom_style granular
atom_modify map array # for allocating the memory, IDs are stored in lookup table of length N
boundary m m m
newton off
echo both

communicate single vel yes
#processors 2 1 1

units si

region reg block -0.05 0.05 -0.05 0.05 0. 0.15 units box
create_box 1 reg

neighbor 0.002 bin
neigh_modify delay 0

#Material properties required for new pair styles

fix m1 all property/global youngsModulus peratomtype 5.e6
fix m2 all property/global poissonsRatio peratomtype 0.45
fix m3 all property/global coefficientRestitution peratomtypepair 1 0.3
fix m4 all property/global coefficientFriction peratomtypepair 1 0.5

#New pair style
pair_style gran/hertz/history 1 0 #Hertzian without cohesion
pair_coeff * *

timestep 0.00001

fix gravi all gravity 9.81 vector 0.0 0.0 -1.0

#fix zwalls all wall/gran/hertz/history 1 0 zplane 0.0 0.15 1
#fix cylwalls all wall/gran/hertz/history 1 0 zcylinder 0.05 1

#distributions for insertion
fix pts1 all particletemplate/sphere 1 atom_type 1 density constant 2500 radius constant 0.0085
fix pts2 all particletemplate/sphere 1 atom_type 1 density constant 2500 radius constant 0.0025
fix pdd1 all particledistribution/discrete 1. 2 pts1 0.3 pts2 0.7

#region and insertion
group nve_group region reg
region bc cylinder z 0.0 0.0 0.015 0.05 0.12 units box
fix ins nve_group pour/dev nparticles 5000 1 distributiontemplate pdd1 vol 0.55 200 massflowrate 0.1 vel uniform 0. 0. 0. 0. -1.0 region bc

#apply nve integration to all particles that are inserted as single particles
fix integr nve_group nve/sphere

#output settings, include total thermal energy
compute 1 all erotate/sphere
thermo_style custom step atoms ke c_1 vol
thermo 1000
thermo_modify lost ignore norm no
compute_modify thermo_temp dynamic yes

#insert the first particles so that dump is not empty
run 1
dump dmp all custom 200 post1/dump1.pour id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
#insert particles
run 80000 upto
dump dmp1 all custom 200 post/dump1.pour id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
unfix ins