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I don't know what happened but recently, maybe from about a month ago or so, when viewing highlights on iPhone, it goes to the beginning of the book instead of the place where I am at the moment, making the highlights viewing useless.

Also I bought an old used Android phone recently and downloaded Kindle on it, and noticed that an option to view the highlights is not there at all, (same with search function). The Android phone uses Kitkat (that's as high as it goes).

This is strange as I used to have the same type of Android phone last year (which I lost and hence I bought it again this year) and it did have ability to view highlight back then.