[JS] canvas - circle and filling issue

[lkos]

Hi. I draw circle, and filled it up with red color. Why filling looks like moved to the left? How to fix it?

Edit: It’s weird. On my mobile it looks fine. On laptop border around circle is thicker on the right side.

Picture made by phone - border is clearly not the same width:

function init(){
    game.draw(game.set());
    
}

var game = {
    canvas: document.getElementById("field"),

    set : function() {
        let ctx = this.canvas.getContext("2d");
        ctx.fillStyle = "blue";
        ctx.fillRect(0, 0, this.canvas.width, this.canvas.height);
        return ctx;
    },
    draw : function(ctx) {
        
        ctx.beginPath();
        ctx.arc(70,70,40,0,2*Math.PI);
        ctx.fillStyle="red";
        ctx.fill();
        ctx.lineWidth = 3;
        ctx.stroke();
    }
}