I was wondering the same thing about my son. I think some of it may be boredom because he is 2 1/2 and has been saying is ABC's the right way for quite some time, learned all the sounds and is spelling words, early reading etc. Sometimes he does it all backwards and it seems like he has ran out of things to do with the letters so he is switching it up. I wouldn't worry about it but then again I don't know. I have thought my son was Autistic at times because of how obsessive he can be..I guess as parents we always worry
