I have a galaxy flip and sometimes my keyboard reverts back to default even when I have a theme set. Usually it fixes itself if I reset the theme but it stopped working a few days ago, I've tried a lot of things to get it to fix and the only thing that seems to work is rebooting my phone. I just did this and it worked so I don't know how long this will last but if you are having this problem try to reboot your phone!
