My sister found this bug several months ago. This is what she said about it:
"When I look up, it looks down, and vice versa. I tried deleting the app and re-installing it, but the glitch continues to happen."
I think the reason it is not happening to me is because I think mine is a 4th generation and hers is a 3rd generation. I can confirm this is happening because I have seen it at least once. I cannot give you screenshots because it is not my device. My sister is very annoyed by this and doesn't play MCPE often for that reason. I have not experienced this glitch but I can 100% confirm this happens.
Comments 2
Thank you for your report!
However, this issue has been closed as Cannot Reproduce.
We were unable to reproduce the problem you are describing in the latest version. Please try adjusting the Y axis setting, as suggested. (Settings→Touch→Invert Y-Axis)
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Look in the touch settings and turn off 'invert y-axis'. That should fix it.