Projectiles sometimes fly through walls

Sometimes my projectiles fly through meshes: walls, floors, ceilings. All meshes, including projectiles, have collisions. When I throw a granade, it may fly through the same wall and may not. Why does it happen?

I don’t have much experience in UE yet, but I’m familiar with collision systems so here’s my though:

this problem can happen when the projectile is too fast for the simulation solver:
the collision occurs between two frame, then it’s just skipped. I would try to reduce the projectile speed and see if it still happens. If not, try to increase the collision substeps to make the detection more accurate (it can be computation expensive)

Thank you for the advice. I`ll try to experivent with this.

I just checked “Use CCD”.