I am not an Android tablet user so not 100% sure if there is a display resolution or screen refresh setting option but I assume there are.
The PVZ2 game is over 10 years old so it is possible that it was not made to aware of the current high-res (touch) screen. Could you check if you can change the S9 display setting to standard HD (1920x1080) resolution with 60Hz refresh and see if this makes any difference? Maybe forum members with good Android Tablet knowledge can add comment or make further suggestions?
