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I don’t know the HTML details, but Amazon’s footnote implementation tries to determine if something looks like a footnote (that can be extracted from its location and displayed in a pop up dialog), or something that navigates to another location in the book. Sometimes it fails to recognize a footnote as a footnote because the pattern it is looking for isn’t there, so it just jumps to a new location, and then you have to find your way back. I think you can find discussion of this in the Kindle Format forum here, if you are interested.
I don’t have my Paperwhite (also 2018) handy, but have at times found the touch screen finicky, or more so than the Voyage I have at hand. If my fingertip is particularly cold or dry, sometimes touch does not register. A stylus would give more consistent behavior if that is the issue.
Some publishers format the footnote link using text that is smaller than the ‘body’ text, just as is typical in print books. It’s probably a bad practice for ebooks, as it can make the target too small to tap consistently. And if you fail to hit the target, and the target is in the menu bar tap zone, it’s going to reveal the menu. So blame the publisher (there is a Report Content Error feature you can use), but again, a stylus might help in achieving more consistent results. Or you could increase the text size, at least when reading that book (Themes make it a little easier to restore your preferred text size).
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