We are aware of the issue and our teams are working hard on this but I am afraid we cannot fix this issue in the immediate future as we will need to build a completely new Peak keyboard in every language so this can be used instead of the standard keyboard of your device.
The last Android update included a couple of changes which prevents Peak to use your standard keyboard now.
What we can recommend as a temporary solution is that you try and switch to the Google keyboard called Gboard instead of the Samsung default keyboard and also turning off predictive text from your device.
Or you can swap this game for another one (if you are a Pro user). You can swap 1 game per category per day if it appears in your Brain Workout of the day (this does not work for the other workouts I am afraid). To switch a game in your workout, what you need to do is, before you start playing, switch the game you want by swiping it to the left with your finger. Please note that you can only swap games if you haven't started playing yet.