Occasionally when standing near water, the first person camera shifts about 3/4 of a block up. This doesn't change your actual height, as can be seen by going into third person, however, the shift does cause your crosshair to become inaccurate. It's hard to explain, so [here|https://youtu.be/fsH3Njnwq7g] is a video.
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Thank you for your report!
We're actually already tracking this issue at MCPE-51142, so I will resolve and link this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
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