Keys that will not produce the right letters are read as frustration at not being able to express yourself. Dream books link it to messages you feel unable to get across.
Does the traditional reading fit your dream, or did it mean something else to you?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.