Scratch

I am making a typing system for my new game. It works by receiving messages and 'typing' (stamping) the letter. After I fixed the stamping problem (with some help), I have just finished making the upper case costumes.
However, when I had finished making the messages for those (I thought I had about 56-62 messages by now) it started getting rid of the lower-case messages! When I click 'more' at the bottom of the list it changes to a small list, then when I press it again, it goes back to the beginning, and the lower-case messages are not visible (although it still has them in the typing sprite for 'when I receive').
Is this a limitation of Scratch? If so, are there any ways I can get around it? (without making the typing sprite type everything letter by letter, which would be incredibly boring to do).