Hey there! For some mobile devices, the game seems to be having difficulty understanding what makes up a touch vs a drag motion. There have only been a few complaints about this issue despite the game running with these input settings for a year to date.
We will look into the matter and try to fix it as we work on refactoring the framework code, but for now our advice to people having this problem is to try to make more accurate touches, or indeed use auto play. For the latter, in the options menu you can customize the reading speed to between 100 and 400 words per minute as well as the auto play delay (seconds of waiting after a text box finished unveiling). Hopefully that should be enough to help you for the time being.