I have a couple of end users who runs the screen resolution 1366*768, for me, a very strange resolution.

In a certain view a grid does not show at their computers, if i simulate the resolution in chrome, safari and mozilla it does display the grid.

What could be the "problem" I do think they have a bigger font in windows or in the browser or magnify somehow that makes the grid dissapear but shows the rest of the components on the screen.
But they say that they have not a bigger font or magnify the size in their browsers?!

What could i debug? I am saving screen resolution, operatingsystem, version of browser.

One of the user is using windows 7 and another windows 10 so i don't think the older OS does something