Responsive or not?

Hi all. how are you.
I got a project from work to design a new website for desktop and mobile.
I have some experience with axure but its my first time doing something responsive.
I followed tutorial on youtube and build something very simple in 3 dimensions 360px/768px/1200px.
when i test in chrome dev tools and tried to view the prototype in Galaxy S5 (360X640px) or iPad (768x1024px) it doesn’t fit the screen size and looks smaller even though i build with the correct size
What am i doing wrong?
i really hope to understand this very quickly.

Thank you All

mobile first.rp (79.7 KB)

Hi Amir!

I know this doesn’t help, but I tried your file out on my laptop and it fit those views perfectly. I tried changing the screen resolution and it still worked. But I can see from your screenshot that something isn’t right.

Here’s what I see:

i also checked on my pc and its working perfectly.
i dont know why when i publish it from my mac it does not work the same