In my project “Letter Destroy” I keep getting a costume error where one sprite will turn into another sprites costume with the same size, which I never implemented. Like with the alphabet I wrote out with each letter piece by piece. But when ever I want to change to a random costume in a Sprite, the costume turns randomly into one of my other randomized sprite costumes. Sometimes even separate sprites that are not random they turn into the Alphabet costumes and the plus and minus signs. Here is the link to my Project, and I can't progress on it until this bug is relieved, please fix this.
Link: http://scratch.mit.edu/projects/26636941/

This belongs in Bugs and Glitches forum

No digit 0 in sprite 4?