Happens to me all the time, too, because, by habit, I click the phone Back button, not your app's Back, which is at the top left of the page. Could help if your Back were in the lower/end/right corner part of the page, where the reader tends to be when going back. Since now it is left up, at the beginning of the page, and long scrolled away from, the tendency is not to see it and not have the instinct to go all the way back up, as an extra step, before backing.

Hmm, I see what you mean. Search is a modal not a separate page, so it doesn't allow using the back button. This is something we could fix.