- clear WF_WEAPONBOBBING in P_FireWeapon, because otherwise the first frame of the fire animation will be drawn in the current bobbing position and not centered.

src/p_pspr.cpp

@@ -536,6 +536,7 @@ void P_FireWeapon (player_t *player, FState *state)
 		return;
 	}
 
+	player->WeaponState &= ~WF_WEAPONBOBBING;
 	player->mo->PlayAttacking ();
 	weapon->bAltFire = false;
 	if (state == nullptr)
@@ -572,6 +573,7 @@ void P_FireWeaponAlt (player_t *player, FState *state)
 		return;
 	}
 
+	player->WeaponState &= ~WF_WEAPONBOBBING;
 	player->mo->PlayAttacking ();
 	weapon->bAltFire = true;