Names all in uppercase?

I'm probably missing something really obvious, but how do you name your people with lowercase letters? Capslock is turned off and I'm not holding shift, but the letters all come out in uppercase. I want to call my first little person Poppy but I can only call her POPPY and it's annoying me!

Have you tried completely closing the game and re-opening it?

I just opened my personal game (on my desktop), and had no trouble renaming all of my family members with lower case letters, and have not had any reports on only uppercase letter problems before.