another glitch

Buf0.glsl

float rand(vec2 c)
{
	return fract(sin(dot(c.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    vec2 uv = fragCoord/iResolution.xy;
    float t = floor(iTime * 60.0) / 60.0;
    fragColor = vec4(rand(sin(uv) + t));
}

Main.glsl

void mainImage( out vec4 fragColor, in vec2 fragCoord )
{
    // Normalized pixel coordinates (from 0 to 1)
    vec2 uv = fragCoord/iResolution.xy;
    vec2 uvNoise = uv;
    uvNoise.x *= 0.1;
    uvNoise.y *= 0.7;
    uvNoise *= 0.2;
    uv.x -= 0.05 * pow(sin(3. * uv.y + iTime * 0.5), 2000.); 
    
    vec4 nsScale = texture(iChannel0, uvNoise);
    nsScale = smoothstep(0.4, 1.0, nsScale);
    nsScale.x *= 0.5;
    
    vec4 ns = texture(iChannel0, uvNoise + nsScale.xy);
    ns = smoothstep(0.99, 1.0, ns);

    // Time varying pixel color
    vec4 col = ns;
    col.r += texture(iChannel1, vec2(uv.x + 0.1 * ns.x, uv.y)).r;
	col.g += texture(iChannel1, vec2(uv.x + 0.1 * -ns.x + 0.004, uv.y)).g;
    col.b += texture(iChannel1, vec2(uv.x + 0.1 * ns.x - 0.004, uv.y)).b;
    
    // Output to screen
    fragColor = vec4(col);
}