Please reduce the phenomenon of tank and bullet jumping

[a1333eqwe]

It is terrible.

[a1333eqwe]

When you boom but the bullet fly to the sky after it touch floor.

[Toilet_Paper1]

so thats what’s happening when I shoot HE onto a flap surface. I always though it would explode on impact and would only expect this from ap shells

[a1333eqwe]

SKY：Hey！why bullet rush to me？