? I suffer from that sometimes, but in my case, it is a case of missing letters. So when I type a word, I might miss out a letter(or words even).
This is very bad sometimes, because the entire meaning of the sentence can change. So instead of saying,
"I don't think it's bad."
I type,
"I think it's bad."
You have no idea how many faux pas I have had in mIRC because of this problem.