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Random terrain generation woes

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Hi! I'm having problems generating a random terrain for my isometric engine. Actually it's working quite fine, but there's one edge on my terrain (the lower right one) that's freakting out. Here's a screenshot: And this is how I create my terrain:
for(int nIndexY=0; nIndexY<128; nIndexY++)
		for(int nIndexX=0; nIndexX<128; nIndexX++)
			// Vertice config
			//  1_____2
			// 4|\    |
			//  |  \  |
			//  |____\|3
			//  6     5
			int x=nIndexX-128;

			// Vertice 1
			vTerrain[((nIndexY) * 128)+(nIndexX)].x=(float)x;
//			vTerrain[((nIndexY) * 128)+(nIndexX)].y=(float)nHeightArray[nIndexY][nIndexX];
			vTerrain[((nIndexY) * 128)+(nIndexX)].y=(float)((rand() % (1*1000))/2000.0f);
			vTerrain[((nIndexY) * 128)+(nIndexX)].z=(float)z;

			vTerrain[((nIndexY) * 128)+(nIndexX)].tu1=texX;
			vTerrain[((nIndexY) * 128)+(nIndexX)].tv1=texY;

//			int col=nHeightArray[nIndexY][nIndexX]*5;
			int col=128;
			vTerrain[((nIndexY) * 128)+(nIndexX)].dwColour=D3DCOLOR_ARGB(255, col, col, col);

	// Now that we have our vertices, we create an index buffer array for them

	for(int nIndexY=0; nIndexY<128; nIndexY++)
		for(int nIndexX=0; nIndexX<127; nIndexX++)
			//int nIndexY=0;
			sIndices[nArrayIndex]=((nIndexY+1) * 128)+nIndexX;
			sIndices[nArrayIndex+1]=(nIndexY * 128)+nIndexX;
			sIndices[nArrayIndex+2]=((nIndexY+1) * 128)+nIndexX+1;

			sIndices[nArrayIndex+3]=((nIndexY+1) * 128)+nIndexX+1;
			sIndices[nArrayIndex+4]=(nIndexY * 128)+nIndexX;
			sIndices[nArrayIndex+5]=(nIndexY * 128)+nIndexX+1;
It's a slightly modified code from a terrain tutorial. The terrain looks as expected, except from the one edge on the screenshot. what's going wrong? thanks in advance!

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