You have all of your 3D layers and the camera turned off. Only layers 6 and 7 are selected so they show up in all 4 views even though they are 2D layers.
Turn on the camera or turn on one of the 3D layers and the 2D layer boundaries will still be visible in all 4 views but the image will only appear in the Active Camera view. Active Camera is the only view that will render, but you can preview any view. There is no bug, it's just the way AE works.
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