Re: the iPad, can you please let us know what model the device is and the OS version? We’re unable to recreate that bug here in our office.
For the monitor vs. iPad, the dashboard blocks are horizontally responsive (they expand / contract to the screen size) but the height is fixed. Hence the different aspect ratios you’re seeing.
As for mobile, those blocks are likely ordered in the order they were added to the dashboard; we collapse to a single column because following the dashboard grid just doesn’t work on such a small device. Admittedly we could do a better job of that and we have some such changes coming next year.