Point Sprite problem

Hi
I have some problem with Point Sprites rendering and I am surprised it
appeared in this place.

I have particle struct




Code:
struct Particle
{
D3DXVECTOR3 m_Pos;
D3DXVECTOR3 m_Velocity;
D3DCOLOR m_Color;
};


Also standard Vertex Struct needed for VertexBuffer
During particle initialization I am setting m_Pos on (100.0f, 100.0f,
1.0f) and m_Velocity on (50.0f, 0.0f, 0.0f)
Position of every particle is counted using this formula



Code:
particles.m_vPos += particles.m_vVel * (float)dElpasedFrameTime;




So I am assuming that particle should go along X axis only, but there
is something weird it looks like it goes along X- and Z-axis, even if
m_Velocity.z=0.0f;

I thought it has something with matrices but I set them orthographic.



Code:
D3DXMATRIX matrix;
D3DMatrixIdenity(&matrix)
d3dDevice->SetTransform( D3DTS_WORLD, &matrix);
d3dDevice->SetTransform( D3DTS_VIEW, &matrix);

D3DXMatrixOrthoOffCenterLH(&matrix, 0.0f, 1024.0f, 768.0f, 0.0f, 0.0f,
1.0f)
d3dDevice->SetTransform( D3DTS_PROJECTION, &matrix);



Here is the code that renders the particie.



Code:
d3dDevice->SetRenderState( D3DRS_ZWRITEENABLE, FALSE );

    d3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, TRUE );
    d3dDevice->SetRenderState( D3DRS_DESTBLEND, D3DBLEND_ONE );



d 3dDevice->SetRenderState( D3DRS_POINTSPRITEENABLE, TRUE );
d3dDevice->SetRenderState( D3DRS_POINTSCALEENABLE,  TRUE);
d3dDevice->SetRenderState( D3DRS_POINTSIZE,     FtoDW(1.0) );
d3dDevice->SetRenderState( D3DRS_POINTSIZE_MIN, FtoDW(1.0f) );.
d3dDevice->SetRenderState( D3DRS_POINTSCALE_A,  FtoDW(0.0f) );
d3dDevice->SetRenderState( D3DRS_POINTSCALE_B,  FtoDW(0.0f) );
d3dDevice->SetRenderState( D3DRS_POINTSCALE_C,  FtoDW(1.0f) );

	Vertex *pPointVertices;

	VertexBuffer->Lock( 0, MAX_PARTICLES * sizeof(Vertex),
		                   (void**)&pPointVertices, D3DLOCK_DISCARD );

for( int i = 0; i < MAX_PARTICLES; ++i )
    {
        pPointVertices->posit = particles[i].m_Pos;
        pPointVertices->color = particles[i].m_Color;
        pPointVertices++;
    }

    	VertexBuffer->Unlock();


d3dDevice->SetStreamSource( 0, VertexBuffer, 0, sizeof(Vertex) );
d3dDevice->SetFVF( Vertex::FVF_Flags );
d3dDevice->DrawPrimitive( D3DPT_POINTLIST, 0, MAX_PARTICLES );


    d3dDevice->SetRenderState( D3DRS_POINTSPRITEENABLE, FALSE );
   d3dDevice->SetRenderState( D3DRS_POINTSCALEENABLE,  FALSE );

    d3dDevice->SetRenderState( D3DRS_ZWRITEENABLE, TRUE );
   d3dDevice->SetRenderState( D3DRS_ALPHABLENDENABLE, FALSE );
}


I have no idea what is going on.