I'm not really sure myself, I tried typing with a screen keyboard too. I have both "i" and "ı" on my keyboard but tried them both. I didn't try using CAPSLOCK maybe that could have helped?
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I was able to reproduce it! I tried using a Turkish keyboard (I don't know if that is what you are using but that's where found both İ and I to be present) and it did the same thing as you said. If you switch to any English keyboard it should work. I'll also add it this to the game page for people to know the game works specifically with an English keyboard. Sorry for the inconvenience 😓