Hello,
Our Theme is Responsive on all the standard devices.
I am sorry but this is not the standard way of testing the site, every Theme in the world uses certain breakpoints to change the layout as per the screen resolution, and Woodmart also based on that theory, Woodmart uses the Bootstrap framework which works on certain predefined rules for the different layouts on different screen resolutions, like for Desktop ( start from 1025px), For Tablets ( from 992px to 1024px) For Mobile. ( end till 1023px) these are the standard points.
So if you test the site like you are doing simply resizing the browser then on a certain point/screen resolution it must break the layout.
You must have to test your site on the real devices OR on the online simulator like Responsinator.
Best Regards