Landscape UI does not show on iPhone 6 plus - ios

I have an app to run in landscape mode only. I tested on iPhone 4, 4s, 5, 5s, 6. It works as expected. However, when I tested it on iphone 6+, with the simulator. Two out of three pages were broken. For the broken pages, only the navigationbar appears. The rest UI did not show up.
Why would this happen? What is the difference for iPhone 6 plus?
storyboard
constrains on the image
does not work in landscape
work in portrait

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Learn more about Zoomed Mode here.

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