Collision not occurring for some particles?

I have an object (named “PARTICLE_TEST”) creating particles .
I have a box object that has collision turned on. When particles collide with it, most are bounced but some of them go through this box object.
Is there some way to prevent this weird behavior? I am uploading the test blender file. Thank you.

TEST - Particle Collision.blend (1.2 MB)

Particle systems seem to have problems when they are positioned too far from the origin. I’m not sure of the exact distance but moving your simulation to within 100 meters of the origin will fix it.

Also turning on “Size on deflect” helps and no particle will get through :wink: