When touching a text input on Android, you get a popup with options like "select all" and "paste" and whatnot. That popup positions itself correctly above the text when you have text selected, but if you only have a cursor, it puts itself on top of the text, covering it up. See screenshot in Bug 513079 (that's for the text tool, but it applies just as well for e.g. any line edit.) This probably needs to be fixed in Qt.