for some reasonn, whenever i paint blood on this map, this weird grid effect happens with the blood, i've attached an imgur link so you can see for yourself https://imgur.com/a/CLaujcE

I tried it myself and the decals looked normal to me. Try disabling the other addons you have, I know that sometimes having maps that use the same name for textures and stuff can potentially cause issues

same there is what it looks like to be l4d blood glitch

im having the same issues with gunshot decals
im using base gunshot decals +mw weapons and when i shoot through an enemy, the gunshots appear larger and in grids of 4

nevermind it happens on all maps so its a map-wide issue not just your map and also with all (assumedly) weapons