Converting 3D interlaced to SBS/TB, getting ghosting

// INTERLACED TO SBSTB 4k PS

  ////////////////////
 /////// MENU ///////
////////////////////

uniform float MonitorWidth <
	ui_tooltip = "MonitorWidth (ex. 3840).";
	ui_type = "drag";
	ui_min = 0.0; ui_max = 3840.0;
> = 3840.0;

uniform float MonitorHeight <
	ui_tooltip = "MonitorWidth (ex. 2160).";
	ui_type = "drag";
	ui_min = 0.0; ui_max = 2160.0;
> = 2160.0;

uniform int SBS <
	ui_label = "Output Mode";
	ui_tooltip = "";
	ui_type = "combo";
	ui_items = "Side-By-Side\0Top-And-Bottom\0";
> = 0;

uniform int LINES <
	ui_label = "Input Mode";
	ui_type = "combo";
	ui_items = "Interlace: Horizontal Lines (Passive3D)\0";
> = 0;

uniform int EYESSWITCHED <
	ui_label = "Switch Eyes";
	ui_type = "combo";
	ui_items = "Normal Eyes\0Switch Eyes\0";
> = 0;


  //////////////////////
 /////// SHADER ///////
//////////////////////

#include "ReShade.fxh"

float3 InterlacedtoSBSTB4K(float4 vois : SV_Position, float2 texcoord : TexCoord) : SV_Target
{
	float2 position = texcoord;

	if (EYESSWITCHED==0)
	{
		if (SBS==0)
		{
			if (int(position.y*MonitorHeight)%2>0.5)
			{
				if (position.x<0.5)
				{
					position.x*=2;
				}
				else
				{
					position.x=position.x*2-((MonitorWidth-1)/MonitorWidth);
					position.y=position.y+(1/MonitorHeight);
				}
			}
			else
			{
				if (position.x<0.5)
				{
					position.x*=2;
					position.y=position.y-(1/MonitorHeight);
				}
				else
				{
					position.x=position.x*2-((MonitorWidth-1)/MonitorWidth);
				}
			}
		}
		else
		{
			if (position.y<0.5)
			{
				position.y=position.y*2+(0.5/MonitorHeight);
			}
			else
			{
				position.y=position.y*2-((MonitorHeight-1.5)/MonitorHeight);
			}
		}
	}
	else
	{
		if (SBS==0)
		{
			if (int(position.y*MonitorHeight)%2<0.5)
			{
				if (position.x<0.5)
				{
					position.x*=2;
				}
				else
				{
					position.x=position.x*2-((MonitorWidth-1)/MonitorWidth);
					position.y=position.y+(1/MonitorHeight);
				}
			}
			else
			{
				if (position.x<0.5)
				{
					position.x*=2;
					position.y=position.y-(1/MonitorHeight);
				}
				else
				{
					position.x=position.x*2-((MonitorWidth-1)/MonitorWidth);
				}
			}
		}
		else
		{
			if (position.y<0.5)
			{
				position.y=position.y*2-(0.5/MonitorHeight);
			}
			else
			{
				position.y=position.y*2-((MonitorHeight-0.5)/MonitorHeight);
			}
		}
	}

	// Sample display image
	float3 Display = tex2D(ReShade::BackBuffer, position).rgb;

	return Display;
}

technique InterlacedtoSBSTB4K
{
	pass
	{
		VertexShader = PostProcessVS;
		PixelShader = InterlacedtoSBSTB4K;
	}
}