I have not dug into this enough to really comment on it, but and this is just me, certain misspellings may be from copy - paste - accept in browser spell check when you see the underlines.
I have always been under the impression that Quickseller was a somewhat intelligent person and cannot see them doing copy/paste. I'm not sure if they have spellcheck enabled or not, but seif they keep seems like that would be a no if they keep misspelling certain words.