Here is a video demonstrating that: https://streamable.com/7qoqkb

My code is very simple and I don't understand what particularly is wrong with it. Code being:

Main

var roleWorker = require("role.worker");

var gameSpawns = Game.spawns;
var gameCreeps = Game.creeps;

module.exports.loop = function () {
    if(Object.keys(Game.creeps).length < 1){
        gameSpawns["Spawn1"].spawnCreep([WORK,MOVE,CARRY], "worker" + Object.keys(Game.creeps).length);
    }
    
    for(var creep in gameCreeps){
        roleWorker.run(gameCreeps[creep]);
    }
}

Worker role

var roleWorker = {
    
    run: function(creep){
        var sources = creep.room.find(FIND_SOURCES);
        
        creep.moveTo(sources[0], {visualizePathStyle:{
    fill: 'transparent',
    stroke: '#fff',
    lineStyle: 'dashed',
    strokeWidth: .15,
    opacity: .1
}});
    }
    
}

module.exports = roleWorker;

Here's a video with range: 1 and pathing visualised: https://streamable.com/iqk38x

Same as before, updated code looks like:

var roleWorker = {
    
    run: function(creep){
        var sources = creep.room.find(FIND_SOURCES);
        var creepPath = creep.pos.findPathTo(sources[0]);
        
        creep.moveTo(sources[0], {visualizePathStyle:{
            fill: 'transparent',
            stroke: '#fff',
            lineStyle: 'dashed',
            strokeWidth: .15,
            opacity: .1
        }, range: 1});
    }
    
}

module.exports = roleWorker;

var gameSpawns = Game.spawns;
var gameCreeps = Game.creeps;

move this into the main loop.

var gameSpawns = Game.spawns;
var gameCreeps = Game.creeps;

this will be it, yes. since you have it outside the loop, spawns and creeps only get initialized on global resets and not get updated until the next one. this means that the position data on your creeps is the same as on the global reset tick and they end up thinking they havent moved yet. for spawns this could also have side effects like it throwing not enough energy when it's full or spawning when it's not. since it looks like you're playing in sim, you'll have those resets every 10 seconds, fixing the problem and beginning the ordeal anew

i would also advise against using [0] like this. while certain databases generally return objects in the same order, it is undocumented behavior and not guaranteed. it could also lead to your creeps running back and forth because sources[0] returns a different source suddenly

Thanks for the help fellas (oﾟvﾟ)ノ