I am using 2.8.6. I am using Amazing Grace theme (blue version). I don't think this is the theme because it also happened with another theme.
I put in a title, e.g. "She thinks her mother's a Dope" and when I hit save draft or publish it will come out like "She thinks her mother's>>She s=thinks her mother's a dope" or "She thinks her mother's a dope>She thinks her mother's a dope"
Amazing Grace theme has SEO stuff and I try to use that but when the title hijinx start I clear out everything and it still happens.
OK. I'm an idiot. I'll try another theme and see if it happens. Later.