Flipboard has at last been updated to support Android tablets, after many months since release on Android. Users have had to put up with a blown up phone version of the app on Android tablets.
One of the major gripes I've had with Android tablets is that there isn't many tablet specific apps. Sure many apps blow up to fit the screen but they could utilise the bigger screen a lot better.
The new Flipboard is available now is free of course. If it doesn't work right away on your Android tablet, try uninstalling the app and then reinstalling, should fix it.