Particles falling through wall

x/y/z walls, Here's the script, its just a simple test case:

#Particle packing by insertion and successive growing of particles
atom_style granular
atom_modify map array
boundary m m m
newton off
#echo both
communicate single vel yes
units si

# Create total region
region total_reg block -0.1 0.1 -0.1 0.1 0. 0.5 units box

# Create simulation box
create_box 1 total_reg
neighbor 0.002 bin
neigh_modify delay 0

# Create gathering particles region (block) and insertion volume region (cylinder)
region reg block -0.1 0.1 -0.1 0.1 0. 0.3 units box
region reg_pour cylinder z 0 0 0.09 0.1 0.5 units box
# Material properties required for new pair styles
fix m1 all property/global youngsModulus peratomtype 68000
fix m2 all property/global poissonsRatio peratomtype 0.3
fix m3 all property/global coefficientRestitution peratomtypepair 1 0.5
fix m4 all property/global coefficientFriction peratomtypepair 1 0.3
# New pair style
pair_style gran/hertz/history 1 0 #Hertzian without cohesion
pair_coeff * *

# Define timestep
timestep 0.00001

# Create frictional walls at the block region
fix xwalls all wall/gran/hertz/history 1 0 xplane -0.1 0.1 1
fix ywalls all wall/gran/hertz/history 1 0 yplane -0.1 0.1 1
fix zwalls all wall/gran/hertz/history 1 0 zplane 0.0 NULL 1
fix grvty all gravity 9.81 vector 0. 0. -1.

# Define particle size, density, and volume distribution
fix pts1 all particletemplate/sphere 1 atom_type 1 density constant 2500 radius constant 0.005
fix pdd1 all particledistribution/discrete 1. 1 pts1 1.0

# Create group for insertion of particles
# group nve_group region reg_pour <-- is this needed (next 2 fixes)
fix ins all pour/dev nparticles 10000 1 distributiontemplate pdd1 vol 0.6 150 rate 0.5 vel uniform 0. 0. 0. 0. -0.5 region reg_pour

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

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

#insert the first particles
dump dmp all custom 500 post/dump.test4 id type type x y z ix iy iz vx vy vz fx fy fz omegax omegay omegaz radius
run 1000
neigh_modify every 5 check no
#run
run 40000
# Allow particles to settle after insertion
unfix ins
run 40000

Thanks!

Kirsten