Wrong projectile behavior

Hi all!

I’m facing a strange problem with shooting grenades from my weapon :
in 99.9% cases, it does what is expected. But in one particular place on the map, it shoots the grenade too left from expected. The video :

Pic of what is happening there : red (real) is the place where grenade actually explodes, green (expected) is the place where grenade is expected to explode.

I use complex as simple collision for the window + no collision for the glass material and thus the projectile can fly through. I also don’t use any modifiers for the projectile itself (it always flies the same way) or anything of that kind on the map.

  • There is also 1-2 shots in the end of video showing how the projectile is supposed to fly.

Could you please give me some hints, why is it so and which mesh / component / material can cause it?

Thank you!