When entering nether portal to go to the nether it will sometimes unlite and you will be enter through a different nether portal.
[Update] I'm pretty sure this is an issue with loading a 300+ MB world. We were able to reduce the size of the world and we haven't had the same issue since.
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Assuming the portal crosses a chunk border and only the obsidian frame blocks of one side are in a different chunk than the rest, this is the same issue as MCPE-74333.
Did the issue occur ever after the world reducing again, on the newest version? If so, please add it to the affected versions.