Same issue, same ‘Sassy’ template!
I discovered this same bug when testing on an iPad in Portrait mode, which represents itself as 768px wide, clearly in the gap between 600 - 800px. The content on the right side is getting cut off.
Edit: Found a post from Unbounce regarding tablet-specific breakpoints:
Justin Veenema, Online Community Strategist
Perhaps I can give a bit of clarity here. Our Mobile Responsive functionality works by utilizing a single breakpoint that defines if the page should be displayed as desktop or mobile. This breakpoint is based on browser width, so if a browser under 600px wide tries to view the page - it will automatically display the mobile version. This ensures that your users will get the best experience, whether they’re on desktop or mobile.
Tablets are a bit different. Generally, when a full-size website loads up on a tablet in landscape view, it will display just as it would on a desktop browser. However, when a page is loaded on Safari in portrait view, the browser will either attempt to load the full-size website zoomed out; or load a tablet specific version of the page.
Although we don’t have tablet specific mobile break-points, you should be able to load the desktop version on both landscape and desktop without too much of an issue. We’re currently seeing a small bug when initially loading responsive pages in portrait view (only 95% of the page is visible), but this is something we’re aware of and should have a fix for in the future. In the meantime the user might need to pinch-to-zoom to see the entire page, which is something any tablet user will intuitively understand to do.
Our Mobile Responsive functionality has been implemented to ease the pain point of developing separate mobile/desktop versions of each page. We’re still in Beta, which means some things aren’t final just yet, but we’re almost there and we’re happy to hear any feedback you have about the feature.