Shader blurring out scene

Hello everyone! I don’t usually deal with shaders/shadergraph and I’ve ran into a small problem. I have made this shader following a simple tutorial which basically turns the scene to greyscale and then the black into another color.
The only problem is that, unlike the tutorial I saw (which stopped at the greyscale part, the adding color is an improvisation of mine), my result gets all blurred out, can someone help me out please? I’m using URP and here’s screenshots of the graph + results:

How it normally looks:

With the shader: