directx – Horizontal Strains artifacts on Direct3D 9 Render

I am encountering a difficulty in my Direct3D 9 software the place horizontal strains seem at mounted 16-pixel intervals on a render goal floor. Here is the setup:

Atmosphere:
Direct3D 9, Home windows, rendering to a texture render goal.

Render Goal:
Created with:
pD3DDevice->CreateTexture(width, peak, 1, D3DUSAGE_RENDERTARGET, D3DFMT_A8R8G8B8, D3DPOOL_DEFAULT, &pTextureImg, NULL)
then retrieved the floor with pTextureImg->GetSurfaceLevel(0, &pSurfaceImg). Dimensions are 1024×576.

Rendering:
Utilizing DrawPrimitiveUP(D3DPT_TRIANGLESTRIP, 2, vertices, sizeof(Vertex)) to attract a textured quad (supply texture has excellent edges) and a trailing impact (stable coloration quad with alpha mixing).

Signs:
Horizontal strains seem each 16 pixels (64 bytes in A8R8G8B8) on pSurfaceImg, seen in saved PNGs (D3DXSaveSurfaceToFile).
Strains are faint, mounted in place, and solely noticeable on earlier frames when trailing is lively (mixing with alpha < 1).
The supply texture (obj_img.texture) has no such artifacts.

Makes an attempt:

• Modified mixing: SetRenderState(D3DRS_ALPHABLENDENABLE, FALSE) for ultimate output, TRUE for picture rendering – resolved undesirable edge pixels however not the strains.
• Adjusted vertex coordinates (from -0.5f offsets to actual 0 -> width/peak) – no change.
• Examined D3DFMT_X8R8G8B8 as an alternative of A8R8G8B8 – strains persist.
• Tried D3DPOOL_SYSTEMMEM – unsupported for render targets on my {hardware}.
• Sampler settings: D3DTADDRESS_CLAMP, D3DTEXF_LINEAR for all filters – no impact.

Suspicions:
{Hardware} tiling (16×16 pixel tiles) in D3DPOOL_DEFAULT amplified by trailing/mixing.
Potential render goal alignment or driver subject.

Instance of issues: